Name: _____Alvaro_________________________________ Date: ________________________ Student Exploration: Element Builder Vocabulary: atom‚ atomic number‚ electron‚ electron dot diagram‚ element‚ energy level‚ ion‚ isotope‚ mass number‚ neutron‚ nucleus‚ periodic table‚ proton‚ radioactive‚ valence electrons Prior Knowledge Questions (Do these BEFORE using the Gizmo.) 1. What are some of the different substances that make up a pizza? _____________________ ___________________
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glass molecules and prevented the droplet from falling when the glass was turned upside down. Water is polar. Its electrons are unevenly distributed among the molecule with two unshared electron pairs on the oxygen atom. The hydrogen atoms align themselves along one side of the oxygen atom‚ causing a slightly positive and slightly negative side. This causes a dipole to occur. Since glass is also polar‚ the water and the glass will be attracted to each other because of their positive and negative charges
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molecule. atom. cell. electron. Question 3 of 20 Which of the following are found in the nucleus of an atom? Protons Neutrons Electrons 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. Question 5 of 20 What is the maximum number of electrons the innermost shell can hold? 1 2 4 8 Question 6 of 20 An atom becomes an
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that holds atoms of elements and ions together to become a stable‚ new substance called a compound. -the number of valence electrons determines if an atom will form a chemical bond. -metals tend to give up electrons to other atoms. -nonmetals tend to take electrons from other atoms. -noble gases will not form a chemical bond because these atoms already have a full outer shell of energy. Ionization: the process of gaining or losing electrons to become an ion. -ion: atom that has a
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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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Atom Bonding Lab Introduction: Atoms bond in covalent bonds and ionic bonds. A covalent bond is when atoms share electrons in order to gain stability with each other (Larsen). To have stability which each other‚ the atoms share electrons so that their outer electron shell is equal. Ionic bonding is the complete transfer of valence electron(s) between atoms. It is a type of chemical bond that generates two oppositely charged ions (Larsen‚ 2010). Element that have a positive ion are able to bond
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does Dalton’s atomic theory account for the fact that when 1.000 g of water is decomposed into its elements‚ 0.111 g of hydrogen and 0.889 g of oxygen are obtained regardless of the source of the water? *Using Dalton’s theory‚ it is said that he atoms of elements combine in constant ratios to form compounds. Regardless of the water source‚ when the water was decomposed to its elements‚ there is really a constant ratio between the two elements composing the water. 6. Summarize the evidence
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emitting ionising particles or radiation through the process of radioactive decay. Ernest Rutherford and later Paul Villard discovered the three types of radiation: -radiation (nucleus of helium atom); -radiation (electron); and -radiation. (a) (i) Define the term isotope. Answer: Isotopes are atoms having the same number of protons / proton number / atomic number / of the same element but have different number of neutrons / different mass numbers / different number of nucleons Comments:
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1808. His theory was consisted of the following: * all matter is made up of atoms‚ * atoms are indivisible and can neither be created nor destroyed‚ * all the atoms of an element are identical * compounds are formed by the chemical combination of atoms in small whole number ratios. Dalton called these groups as “compound atoms” which we call “molecules” today. Today‚ we know that atoms are divisible and that all atoms are not the same‚ there are isotopes in the nature. So‚ John Dalton was wrong
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bond‚ which results in bromine acting as an electrophile. In this reaction‚ the cinnamic acid reacts as an alkene. Alkenes are unsaturated hydrocarbons with a carbon-carbon double bond. In a double bond‚ a pair of electrons lies between the carbon atoms in a σ bond and the other pair of shared electrons lie above and below the plane in a π bond. This electron rich area of the molecule is fairly exposed for electrophilic attack. An electrophile is a species that is attracted to an electron-rich site
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