correct answer is: electrons. Question 2 of 20 The structural unit that retains the properties of an element is the molecule. atom. cell. electron. 5 out of 5 Correct!! Question 3 of 20 Which of the following are found in the nucleus of an atom? Protons Neutrons Electrons A and B 0 out of 5 The correct answer is: A and B Question 4 of 20 The component of an atom or molecule that is most important in determining its chemical properties is the isotope. neutron. electron. proton. 0
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Electrons" Theory 14 Conductors‚ Insulators and Semiconductors 16 25 IONIC BOND Ionic bond is formed when electron transferred from a valence shell of an atom to the valence shell of another atom. Ionic bond involves electron transfer across two atoms. The atom which donates the electron is called cation which is a positive ion whereas the atom which gains the electron is called anion which is a negative ion. The opposite charge of cation and anion attract one another due to the electrostatic force
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Atomic Model Project What is an atom? An atom is the basic unit of a chemical element‚ but‚ did you know what an atom is made out of even smaller particles? An atom is made out of protons‚ neutrons‚ and electrons. Aside from that‚ inside an atom there is a nucleus‚ and there are also 3 energy levels. Let’s start with the nucleus‚ the nucleus is the very small center core of an atom. The nucleus is located inside the atom‚ In the center. Within the nucleus‚ is a group of smaller
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CaN2O6 Find the number of atoms in 7.6 g of sodium phosphide. 7.6 g x 1 mol x 6.02 x 1023 molecules x 4 atoms Na3P = 1.8 x 1023 atoms 99.94 g 1 mol 1 molecules How many C atoms in 60.5 g of sucrose? C12H22O11 molar mass = 342.34 g/mol 60.5g x 1 mol x 6.02 x 1023 molecules x 12 atoms C = 1.28 x 1024 atoms 342.34 g 1 mol 1 molecules If 3.75 x 1024 atoms of hydrogen are found
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actual physical constructions of mental images; they can also be mathematical models‚ for example the model of a structure of an atom or graphing a wave. There are many uses and limitations of using models in science. The Plum Pudding Model is an atom model proposed by J.J Thomson‚ the physicist who discovered the electron. In Thomson’s "Plum Pudding Model" each atom was a sphere filled with a positively charged fluid. The fluid was called the "pudding." Scattered in this fluid were electrons known
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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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do in fact take up space and have intermolecular interaction. A chemical bond is an attraction between atoms. This attraction may be seen as the result of different behaviors of the outermost electrons of atoms. Although all of these behaviors merge into each other seamlessly in various bonding situations so that there is no clear line to be drawn between them‚ nevertheless behaviors of atoms become so qualitatively different as the character of the bond changes quantitatively‚ that it remains useful
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artificially produced isotopes. 6 An electron has a charge of (1) –1 and the same mass as a proton (3) –1 and a smaller mass than a proton (2) +1 and the same mass as a proton (4) +1 and a smaller mass than a proton 7 The atomic number of an atom is always equal to the number of its (1) protons‚ only (3) protons plus neutrons (2) neutrons‚ only (4) protons plus electrons 8 Which subatomic particle has no charge? (1) proton (2) neutron (3) the nucleus (4)electron
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polar bonds‚ nonpolar bonds‚ avogadro’s number‚ and calculating the atomic mass (unit?) * Chapter 4: Basically about theories of atoms and the atom itself 4-1: Theories The Greeks believed that all matter was composed of earth‚ fire‚ air and water. Democritus: the first person to propose the idea of atoms (that matter was not infinitely divisible): atomos. “Atoms are solid‚ homogenous‚ indestructible and indivisible.” Aristotle - DENIED IT. He is why Democritus’ atomic theory was rejected and
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Structure of the Atom Dense nucleus composed of neutrons (0 charge) and protons (+ charge) and surrounded by orbital electrons (- charge). Neutrons and protons firmly held in the nucleus while electrons are very loosely held and are easy to remove. When electrons are removed from the atom‚ two charged particles (ions) are produced the positively charged atom and the negative electron. Energy is absorbed to remove the electron from the atom. Atomic Notation Chemical symbols such as C for
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