"Atom" Essays and Research Papers


2) B) 4 liters C) 6 x 1023 atoms D) 2 moles Which sample of O2 contains a total of 3.01 x 1023 molecules at STP? A) 16.0 grams B) 32.0 grams B) 6.02 x 1023 C) 2.00 moles D) 1.00 mole D) 1.20 x 1024 What is the total number of atoms contained in 2.00 moles of nickel? A) 118 C) 58.9 C) 1 liter of neon D) 1 gram of neon 3) 4) What quantity is represented by the symbol Ne? A) 1 mole of neon B) 1 atomic mass unit of neon 5) How many moles of hydrogen atoms are present in one mole of...

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Autobiography of an Atom

pADVENTURES of an Atom By: Nicole Zemaitis Atom-Smallest particle of an element that retains the properties of the element. Scientific discovery is how the present day Atomic Theory was made up. The current atomic theory was formed by different scientists over many years, each scientist building on or proving theories wrong. Democritus 460-370 B.C. Narrative: Hello! My name is Anna the Atom. I’m writing to you to describe...

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Atom History

Atom History Essay An Atom is a basic unit of matter that consists of a dense, central nucleus surrounded by a cloud of negatively charged electrons. The Atom was theorized by a man named Democritus of Abdera, Thrace in between c.a 460 BC - ca. 370 B.C. Atom is derived from the Greek word “atomos” , which means to be uncuttable. He had a theory that everything is composed of “atoms”, which he believed that these minuscule objects are indivisible, indestructible and have and always been in motion...

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Bonding Atoms

M-F (12-1) Bonding Atoms to Form Molecules 1) Observe a) Atoms bond together to form molecules b) Some molecules are inorganic (non-living). c) Some molecules are organic (are/were living), containing all or part of Mr. Cohn. d) Atoms can bond ionically, whereby an atom gives up valence electrons and becomes a + ion, and another atom receives those electrons and becomes a – ion. The overall charge on the molecule then becomes zero. e) Atoms can bond covalently...

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History of the Atom

particles called atom. He tried to break down matters into smallest particles. His model was that the matter would stop splitting in halves when it reaches its smallest matter. He called that an atom. * John Dalton In 1803, John Dalton proposed a theory. The theory had 4 parts into it. 1. Elements are made of identical atoms. 2. Atoms of different elements are physically different 3. Compounds are formed by a combination of two or more different kinds of atoms. 4. A chemical...

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Gas and Atoms

change. -snow melting and freezing into ice -fuel being changed into gas for cars -ponds freezing over to have a layer of ice Page 2 : E:\CC_Software\Workbench\CC-MW-CD\part2\phasechange\page2.cml 1. Describe the motion of atoms and molecules in a gas. the atoms and molecules bounce off one another each time they come in contact with eachother. they never bond, but reflect off of eachother and spread around. 2. How are the behavior and arrangements of gas molecules similar to and different...

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Phosphorus Atom

phosphorus atom. A) 4, 2 B) 2, 4 C) 2, 3 D) 4, 3 E) 0, 3 2-There are __________ paired and __________ unpaired electrons in the Lewis symbol for a phosphorus atom. A) 4, 2 B) 2, 4 C) 2, 3 D) 4, 3 E) 0, 3 3- How many unpaired electrons are there in an ion? A) 0 B) 1 C) 2 D) 3 E) This cannot be predicted. 4-What is the electron configuration for the ion? A) B) C) D) E) 5- How many single covalent bonds must a silicon atom form to have...

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Rutherford's Atom Theory Explained

understanding upon the structure of the atom. Before Rutherford, there was a man named Joseph John Thomson who proposed the structure of the atom. He stated that the electrons of the atoms are actually inside the atom, and the atom itself is positively charged, like a “raisin pudding”. The electrons are scattered all around the atom. He stated that the electrons and the positively charged material cancel each other, making it stable. The structure of the atom, proposed by Thomson. (J.J Thomson Plum...

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The atomic number and structure of an atom

The Atomic and Nuclear Structure of an Atom The atom has three main components the protons, neutrons, and electrons. The protons and neutrons make up the nucleus, while the electrons are found outside the atom’s nucleus. Each component of an atom has a charge to it. The protons have a positive charge. The electrons have a negative charge, and the neutrons have a neutral charge. The atoms also have a charge. For example hydrogen can be negative, positive or neutral. These are called...

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Atoms Molecules Elements

 Atoms, Molecules, and Elements CHM/110 William De Vorick June 30, 2014 Atoms, Molecules, and Elements Demetri Mendeleev was trying to organize the elements into a table by weight when he noticed that as the weights increase occasionally the properties of one element would resemble those of an element he already listed so he placed these elements in a column under the ones they resembled chemically ( Capri, PhD, 2003). Each chemical in the vertical rows on the periodic table are...

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Atoms Molecules And Elements Paper

 Atoms, Molecules and Elements Melissa DuBois Chem 110 September 16, 2013 Earl Steven Gurley Atoms, Molecules and Elements Atoms are the smallest unit of matter and a group of atoms can form chemical bonds in order to form a molecule. Molecules are groups of two or more atoms that have bound together and are the makings of matter. Elements are a substance that has only one type of atom that make up that element. First we can learn about how halogens and alkali metals are extremely reactive...

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Atom Research Paper

Atoms Atom is the fundamental building block of all stuff, or what scientists like to call "matter". An individual atom is very small. In fact, the smallest type of atom, hydrogen, has a diameter of 10-8 cm. Every single object is composed of atoms. Our body is made up of many, many individual atoms. There are also many different types of atom. These different types are called elements. Examples of some elements are hydrogen, oxygen, and helium. Under normal conditions many atoms can stick together...

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The development of the theories into the structure of an atom

Over time many theories have been developed into the structure of the atom and what the world around us is composed of. Many scientists and philosophers have dedicated their life works into trying to understand how atoms work and what they are made up of, although not all theories have been accepted they have all come together to form what we know today. It all started from a Greek scientist called Democritus, who developed the idea that everything is made up of smaller things, which he named atomos...

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Tutorial: Atom and Electron Affinity

Mass Number Charge Ar 19 31 17 18 35 20 18 3+ 40 3. In your own words, explain Thomson’s and Rutherford’s contribution to the atomic theory. Give sketches to substantiate your answer. 4. Explain how Bohr contributed in defining the structure of the atom. 5. Magnetic resonance imaging (MRI) is a powerful diagnostic tool used in medicine. The imagers used in hospitals operate at a frequency of 400 MHz (1 MHz = 106 Hz). Calculate: (a) The wavelength (b) The energy in J per photon (c) The energy in kJ...

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Atom Structure Theories

Chemistry: Atom structure theories Scientific research is a multistage and complicated process which requires many creative minds to contribute into its creation in order to be efficacious and present solid results. I’ve been given an information sheet apprising ideas of four scientists whose work was very significant in creating the theory about atom structure we recognise nowadays. Guiding Questions: 1 What significant contribution did each of the following people make to present ideas about the...

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Atom Development with Scientists Involved

Pineda, Carlitos Miguel Ponce M. January 9, 2013 AIT2A Natural Science 12 ATOM DEVELOPMENT WITH SCIENTISTS INVOLVED 400 B.C. - Democritus’ atomic theory posited that all matter is made up small indestructible units he called atoms. Democritus expanded the idea to state that matter was composed of small particles called "atoms" that could be divided no further. These atoms were all composed of the same primary matter with the only differences between them being their size, shape...

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Gizmo: Atom and Valence Electrons

nonmetal atoms can share electrons. As you will see in the Covalent Bonds Gizmo™, atoms form bonds in this way. To begin, check that Fluorine is selected from the Select a substance menu. Click Play () to see the electrons orbiting the nucleus of each atom. 1. The outermost electrons in each atom are called valence electrons. How many valence electrons does each fluorine atom have? ________________________________________ 2. Click Pause (). Drag an electron from the left atom to the right...

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Periodic Properties of Atoms

The Periodic Properties of Atoms The Periodic Table: In the 1870's, the Russian chemist Mendeleev developed the periodic table, based upon the relationship between the atomic weights of the elements and their chemical properties. As one ascends from lightest to heaviest elements, there is a periodic recurrence of chemical properties. For example, the elements with atomic numbers 2, 10, 18, 36, 54, and 86 all are chemically inert (the noble gases), while those with atomic numbers one greater 3, 11...

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Atoms Airs and Chemical Bonding

 Atoms, Airs, and Chemical Bonding Rich McConnell, CH-201 Grantham University Atoms, Airs, and Chemical Bonding 1. Alcohol in our digestive system reacts with oxygen gas to form carbon dioxide and water.  How many grams of carbon dioxide are released if a 10.00 g alcohol sample reacts with 20.85 g of oxygen gas and produces 11.77 g of water? Answer: 19.08g CO2 2. Using the periodic table, fill in the missing information in the following table: Protons Neutrons Electrons Isotope...

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Science Atoms Study

1: The atom Introduction Atoms are the building blocks for matter Everything is made up of atoms 1A: Sub-atomic particles Atoms are made up of 3 sub-atomic particles, 2 of which are located in the nucleus (the heart of the atom) Positively charges protons and neutrally charged (non-charged) neutrons are found in the nucleus Negatively charged electrons are located orbiting the nucleus in shells. They stay in orbit because the electrons are attracted to the protons 2: The Element...

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The Modern Concept of the Atom

modern concept of the atom. I am going to give a brief history of the atomic model including Thomson's atom, Rutherford's atom, Bohr's atom, and Schrödinger's atom. I am going to include a diagram for each of these models. In 1897 physicist, J.J. Thomson, shortly after discovering electrons, proposed his Plum-Pudding model of the atom. He based this model on the two facts that he knew at the time: 1. atoms contain small negatively charged particles called electrons and 2. atoms behave as if they...

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Elements and Atoms Study Guide

Science Chpt 11 and 12 Study Guide Name _________________ Chpt 11 1. Democritus named the atom. The word atom means __________________________ 2. Define atom and determine if you can or cannot divide it into simpler substances. – 3. List the 3 subatomic particles of the atom are and their charges a. b. c. Be able to identify those particles on a diagram!!! 4. Be able to label a diagram of a atom using information from the Periodic Table 6 _________________________ ______________________...

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historical development of atom

The notion of the atom all stared about 450 BC when a Greek scholar starting think when can something break on more, when are the pieces at their smallest, this mans name was Leucippus. Leucippus also had pupil who also thought the same way as Leucippus, his name was Democritus. They developed there ideas and when Democritus died his theory summed up briefly was that everything in the world was made of tiny pieced that could not be broken up any more. That how the word atom was derived from the...

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Tutorial: Atom and Nucleon Number

number of significant figure in each of the following numbers. a) 2.0560 b) 0.000372 c) 300.6 d) 70030 6. What is the number of significant figures in each of the following measurements? a) 56 mL b) 2900 g c) 40.2 g/cm3 d) 0.0000003 cm e) 4.6 x 1019 atoms 7. Calculate and round the answers to the correct number of significant figures. (a) (b) (c) (d) (e) (f) 3.476 + 0.002 81.4 g  0.112 g 81.4  104.2 4.003  18.3 0.321 + 0.0041  1.2 6.810  0.0230  3.21 8. Calculate and round the answers to the...

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Atom and Proton Electron

Please silence and put away all cell phones and pagers! Part I. This section is multiple-choice. Fill in the letter corresponding to the best answer on your Scantron form #882. 1. The __________ and __________ contribute most to the mass of an atom, while the _____________ determines the atom’s chemical behavior. A. B. C. D. E. proton, neutron, electron proton, electron, neutron neutron, electron, proton proton, photon, neutron none of the above 2. The symbol 63 Cu represents an isotope of...

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Summary of How the Atoms Have Changed Throughout the Years?

As Chemistry Summary of how the atoms have changed throughout the years? One of the first founders of the idea of atoms was called Democritus, which was in 430 BC. He argued that there were an infinite number of different types of atoms. They were all different shape however they were made from the same stuff. He describes atoms as indivisible particles and also explained certain natural occurrences such as the existence of elements. Atomos (in ancient Greek) means “that which cannot be further...

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Atom and Potential Difference

get from it? 21. Common salt dissolves in water easily. Give reason? 22. Find the concentration of solution in terms of weight percent if 20g of common salt is dissolved in 50g of water? 23. List out any two differences between atoms and molecules?24. Analyze the table and fill in the blanks gas Atomic mass molecular mass Atomicity ozone 16 48 - nitrogen 14 - 2 25. Thy hydroxyl ion concentration of a solution is 1.0x10-8m. What is the PH...

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he atom is the basic unit of chemical matter. The atom is the smallest unit that defines the chemical elements and their isotopes. Everything that is solid, liquid, or gas is made up of atoms. Everything that can be seen and touched is made up of atoms. Atoms are tiny; their size is typically measured in picometers (trillionths of a meter). A single strand of human hair is about one million carbon atoms wide.[1] Every atom is composed of a nucleus made of protons and neutrons (hydrogen-1 has no...

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Etymology The name atom comes from the Greek ἄτομος (atomos, "indivisible") from ἀ- (a-, "not") and τέμνω (temnō, "I cut"),[3] which means uncuttable, or indivisible, something that cannot be divided further.[4] The concept of an atom as an indivisible component of matter was first proposed by early Indian and Greek philosophers. In the 18th and 19th centuries, chemists provided a physical basis for this idea by showing that certain substances could not be further broken down by chemical methods...

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9 Science Atoms And Molecules Test 01

CBSE TEST PAPER-01 CLASS - IX Science (Atoms and Molecules) 1. Atomic radius is measured in nanometers and (a) 1nm = 10-10m (b) 1m = 10-10nm (c) 1m = 10-9nm (d) 1nm = 10-9m 2. Symbol of Iron is :- (a) Ir (b) I 3. Atomicity of chlorine and Argon is (c) Fe [1] (d) None of these [1] [1] (a) Diatomic and Monoatomic (b) Monoatomic and Diatomic (c) Monoatomic and Monoatomic (d) Diatomic and Diatomic 4. Molecular mass of water ( H 2O ) is (a) 18g 5. State law of conservation of Mass...

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Chemistry: Atom and Pure Silver

gases. Air is a(n) what? a. pure substance b. mixture c. element d. compound -------11. How many hydrogen atoms are in a molecule of acetic acid, HC2H3O2? a. 4 hydrogen atoms b. 3 hydrogen atoms c. 1 hydrogen atom d. 2 hydrogen atoms -------12. What mass of gold (specific heat = 0.0305 cal/g°C) releases 1.50 kcal of heat when it's cooled from 500.0°C to 25.0°C? a. 1.97...

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Video Report Video “Nanospace: a Voyage Into Ultra-Microscopic Worlds – Part 1: the Atom Revealed”

plenty of rooms in the bottom” in 1959. This area surely brings many challenges, but at the same time opens limitless potential and opportunities in every aspects of human life. The video “Nanospace: A voyage into ultra-microscopic worlds – Part 1: The atom revealed” is a fascinating story telling a brief history of nanoscience and scientists’ endless efforts to travel to the nanoworld. This inspiring video gives me a clearer imagination about the nanoworld, as well as several life lessons. I realized...

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States of matter

take a while). a) The atoms are not in motion. a.A) not moving. a.B) vibrating about a fixed position. a.C) sliding past each other. a.D) moving independently around the container. b) Is this physically possible (think Third Law of Thermodynamics)? No c) Go up to the tab that says “teacher” and change the temperature scale from Kelvin to Celsius. According to this 0 K = -273 ºC. Change the scale back to Kelvin. d) Notice the pattern of the atoms relative to each other...

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levels of life

Part I: Atomic Structure – Fill in the missing information on atomic structure and organic compounds. Atomic Structure Subatomic Particle Charge Location in an Atom Proton Positive Nucleus Neutron Neutral Nucleus Electron Negative Spherical (outer-shell) Organic Compounds Large Biological Molecule Atoms it Contains Monomer(s) Function(s) in Living Organisms Carbohydrates C, H, and O Monosaccharides Source of energy Lipid C, H, and O Glycerol and fatty acids Cushion...

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Radioactive Decay, Nuclear Fission and Nuclear Fusion

Radioactive Decay, Nuclear Fission and Nuclear Fusion When elements undergo radioactive decay the atoms of one element are changed into the atoms of another element when an alpha or beta particle is emitted from an unstable nucleus. When a nucleus disintegrates and emits an alpha particle it is alpha decay, the alpha particle emitted contains two protons and two neutrons which is equivalent to a helium nucleus being released. Alpha decay occurs because there are too many protons, which causes...

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Pearson Chemistry Notes Ch. 4.1-4.2

4.1 Defining the Atom Overview cannot be seen w/ naked eye def. smallest particle of an element that retains its identity in a chemical reaction Democritus’ Atomic Philosophy Democritus (460 BC- 370 BC) was a Greek philosopher first suggested the existence of atoms said they were indivisible and indestructible did not explain chemical behavior did not use scientific method John Dalton (1766-1844) English chemist schoolteacher used experimental methods he transformed Democritus’ ideas...

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Metallic Bonding

melting points and boiling points suggesting strong bonds between the atoms. Even a metal like sodium (melting point 97.8°C) melts at a considerably higher temperature than the element (neon) which precedes it in the Periodic Table.Sodium has the electronic structure 1s22s22p63s1. When sodium atoms come together, the electron in the 3s atomic orbital of one sodium atom shares space with the corresponding electron on a neighbouring atom to form a molecular orbital - in much the same sort of way that a...

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Teaching Transparency 29 Lewis Structures W TT 29 30 Key

Structures 29 Use with Chapter 8, Section 8.3 1. Step 1 in drawing the Lewis structure for a molecule is to decide which atoms of the molecule are most likely the terminal ones. In the transparency, why are the hydrogen (H) atoms in hydrazine (N2H4) shown as the terminal atoms? 2. Step 2 in drawing a Lewis structure involves determining the total number of valence electrons in the atoms in the molecule. Explain why the total number of valence electrons in N2H4 is 14. 3. Step 3 in drawing a Lewis...

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Lecture 1 Analytical Chemistry

struture The basic building block of all matter is called an atom. Atoms are a collection of various subatomic particles containing negatively charged electrons, positively charged protons and neutral particles called neutrons. Each element has its own unique number of protons, neutrons and electrons. Both protons and neutrons have mass, whereas the mass of electrons is negligible. Protons and neutrons exist at the centre of the atom in the nucleus. Electrons move around the nucleus, and are arranged...

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Atomic Model Timeline

time) is composed of tiny indestructible units, called atoms. Democritus performed no experiments. 1 .All matter consists of invisible particles called atoms. 2. Atoms are indestructible. 3. Atoms are solid but invisible. 4. Atoms are homogenous. 5. Atoms differ in size, shape, mass, position, and arrangement. ->Solids are made of small, pointy atoms. ->Liquids are made of large, round atoms. ->Oils are made of very fine, small atoms that can easily slip past each other. 350 BC Aristotle did...

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Ios 7 Article

half-life using a sample to represent radioactive atoms. Materials 200 M&M® candies, pennies, or other small candy/item with two distinct sides shoe box or other small box with a lid Procedure 1. Place 200 candies in the shoe box, lettered sides up. The candies will stand for atoms of a hypothetical radioactive element. 2. Cover the box and shake it vigorously for three seconds. This is one time interval. 3. Remove the lid and take out any candies (atoms) that have that are now showing lettered sides...

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Chemistry Bonding

6 + (7*2) = 20 The answer is “d” because it does not have eight valence electrons. 64) Explain why each electron structure is incorrect. Replace each structure with one that is more acceptable. a) It is incorrect because neither of the atoms follow the octet rule and doesn’t add up to a correct charge. They don’t have any bonds either. b) The Lewis dot structure doesn’t follow the octet rule, have the correct number of electrons, or any bonds. 74) Ethyl alcohol...

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Periodic Table Trends Essay

of the following atoms listed below has the largest atomic radius? Ca 3. Compared to the atomic radius of a rubidium atom, the atomic radius of a strontium atom is smaller. The smaller radius is primarily the result of the strontium atom having greater effective nuclear charge 4. An element is most likely to have properties similar to those of another element in the same group 5. Most elements are Metals 6. Cations have a _____ charge and are _____ than the atoms from which they...

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Atoms and the Periodic Table Chapter 2 Atoms and the Periodic Table / Elements and the Periodic Table * An element is a pure substance that cannot be broken down into simpler substances by a chemical reaction. * Each element is identified by a one- or two-letter symbol. * Elements are arranged in the periodic table. * The position of an element in the periodic table tells us much about its chemical properties. Atoms and the Periodic Table / Elements and the Periodic...

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The Evolution of the Atomic Theory

theory on the behavior of atoms to the current model, some changes have been made, and some ideas are still the same. Ancient Greek philosophers believed that everything was made up of invisible particles called atmos. Since then the theory of atoms did not progress until 1803. John Dalton was the first scientist to compose a theory of matter based on atoms. Dalton's atomic theory is based on four concepts. He stated: "1. All elements are composed of atoms, which are indivisable and...

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Where Will You Be in 10 Year

ATOM Atoms are the basic building blocks of ordinary matter. Atoms can join together to form molecules, which in turn form most of the objects around you. Atoms are composed of particles called protons, electrons and neutrons. Protons carry a positive electrical charge, electrons carry a negative electrical charge and neutrons carry no electrical charge at all. The protons and neutrons cluster together in the central part of the atom, called the nucleus, and the electrons 'orbit' the nucleus. A...

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Chapter 2 Bio Study Guide

by themselves, they are gases at room temperature.) Atoms = smallest possible piece of an element o A better definition of an atom may be: the most basic unit of matter that cannot be broken down into smaller pieces by ordinary chemical methods. o This can be confusing, because when you read the above definition or when you start looking at the periodic table in class, is oxygen an atom or an element? o An element is essentially the same as an atom. Why do we bother with two different words? • An element...

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Chapter 7 Chemistry Study Guide

Chapter 7 same number of valence electrons=behave similarly(chemical properties) ▪ neon gases (neon, argon) unreactive in chemical reactions(stable) ▪ Gilbert Lewis-octet rule(atoms tend to achieve electron configuration of gas) ▪ atoms of metallic atoms lose electrons, atoms of nonmetal atoms lose or share electrons with another nonmetal elements to achieve a complete octet ▪ to achieve octet, change electrons to ge ns2 np6 configuration ▪ remove electrons=ionization ▪ metals in group...

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CHM 101 Textbook Notes Ch 2

CHEM 101 – General Chemistry I Chapter 2 Reading Assignment Pages 31 - 60 2.1 – What is Matter Made Of? Who 1st discovered atoms – Democritus where the first person to discover atoms. His followers would often think that there were multiple kinds of atoms and not just plain atoms. 2.2 – How Do We Classify Matter? Elements – A substance that consists of identical atoms. Today there are 116 known elements. Example – C= Carbon; H= Hydrogen Compounds – A pure substance made up of two or more elements...

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Bio 1151 Study Guide

required by an organism in minute quantities ATOM- smallest unit of matter that still retains the properties of an element NEUTRONS- no electrical charge ELECTRONS- negative charge PROTONS- positive charge ATOMIC NUCLEUS- formed by neutrons and protons ATOMIC NUMBER- number of protons in its nucleus MASS NUMBER- the sum of protons and neutrons in the nucleus ATOMIC MASS- the atom’s total mass, can be approximated by the mass number ISOTOPES- two atoms of an element that differ in the number of...

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Chemistry Test Notes

7&8 Gauge Sheet 7.1- Ions To find the number of valence electrons in an atom of a representative element, simply look at its group number. Atoms of metals tend to lose their valence electrons, leaving a complete octet in the next-lowest energy level. Atoms of some non-metals tend to gain electrons or to share with another non-metal to achieve a complete octet. The gain of negatively charged electrons by a neutral atom produces an anion. 7.2- Ionic Bonds and Ionic Compounds Although they are...

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The Ionic Lattice

electrons of two different atoms. This attraction results in the two atoms binding together. An ionic bond, also called an electron-transfer bond, is a type of chemical bond that is a result of the electromagnetic attraction between ions of opposite charges, i.e., a cation (a positively charged ion) and an anion (a negatively charged ion). An ion is an atom or group of atoms that has acquired an electrical charge due to the loss or gain of electrons. In an ionic bond, an atom gives or receives electrons...

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Account for the Different Physical Properties and Uses of Diamond, Graphite and the Fullerene You Have Chosen, in Terms of Bonding.

Diamond is a giant covalent network structure, having each Carbon atom sharing electrons with four other Carbon atoms, therefore having four single covalent bonds formed. These Carbon covalent bonds are extremely strong and account for two of diamond’s most prominent physical properties among all elements, hardness and a high melting point. Diamond has a high melting point due to the fact that diamond is a covalent lattice, hence, melting this covalent lattice involves breaking many strong covalent...

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Atomic Theory Studyguide

you will be ready for the next test! History of Atomic Theory (9/13) Answers: Questions: Dalton First scientist to propose a model of the atom Atom Smallest unit of matter Element Substance made of multiple identical atoms Dalton’s incorrect theory The atom is indivisible Thomson Plum pudding model for the atom Electrons Particles suggested by Thomson Rutherford Gold foil experiment Protons Particles suggested by Rutherford Nucleus Where...

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And the (Nobel) Award Goes to... Ernest Rutherford

structure of the atom and the essential nature of radioactive decay. Radioactive decay is the process by which an atomic nucleus of an unstable atom loses energy by emitting ionizing particles. This emission is spontaneous, in which the atom decays without any physical interaction with another particle from outside the atom. Radioactive decay usually happens due to a process which is confined to the nucleus of the unstable atom, but in some cases an inner electron of the radioactive atom is also necessary...

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The Development of the Atomic Theory

whose system he later on developed further. Democritus visualized atoms; atom is a Greek word for indivisible, which means as moving through space, then colliding to form the universe and the natural objects in it. Democritus was said to have excelled in all the branches of knowledge. “His name was associated with the first exposition of the atomic theory of matter, according to which all matter is composed of single, indivisible atoms exactly alike qualitatively.” (Greek: pg 1) His theory...

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Bonds All chemical bonds consist of _______ that hold groups of atoms together and make them function as a unit. A bond will form if the energy of the aggregate is ______than that of the separated atoms. ____________ – energy required to break a chemical bond Bonding involves ________________. 2 Chemical Bonds, cont. In general, there are three types of chemical bonds: I. Ionic bond: Transfer of electrons from one atom to another. Seen primarily in M + NM. Bond is an electrostatic...

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Atomic Theory

disintegration from which it can never be put back together. However, matter can be reintegrated. b) In Greek, the prefix "a" means "not" and the word "tomos" means cut. Our word atom therefore comes from atomos, a Greek word meaning uncuttable. All matter is composed of atoms, which are bits of matter too small to be seen. These atoms CANNOT be further split into smaller portions. 2. At this point, the atomists entered into what their predecessors had postulated to be the origin of matter, namely...

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Test 4

the following items. ​ (14 points) 1.  emitted from a cathode ray tube  Bohr  2.  discovered the neutron  Chadwick  3.  discovered the electron  JJ  4.  postulated the quantum atom  nucleus  5.  discovered the proton  electrons  6.  father of atomic theory  Dalton  7.  location of most of the mass of the atom  Bohr  1.  unlike charges  attract  2.  like charges  repel  3.  charge on a neutron  nonmetals  4.  location of an electron  periodicity    shell  5.  low ionization energies ...

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Quantum Mechanics

discovery in Quantum Mechanics. The current Quantum mechanic model is by far the most accurate example of an atom and how it works. Currently the model depicts a proton (or more than one depending on the atom) and neutron in the nucleus and a an electron rotating around the nucleus in an energy level, or an estimated path of the electron. The first person to purpose the existence of atoms was Democritus. Democritus’ had the right idea however the details of his original theory were not quite right...

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