Nuclear_part2_3 - Walker CH304k Chap 7 Part 2 Nuclear...

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Walker CH304k Chap 7 Part 2 Page 1 of 7 Nuclear Chemistry: Part 2 _________ ___________ is the splitting of a large nucleus into smaller ones. The conservation laws get a twist: it really is the Law of Conservation of Matter and Energy, not just one or the other. Energy can change into matter and matter can change into energy. Matter and energy are related via the equation Atoms may differ from one another in the number of ________________ ______________________ they possess. The number of ________________ an atom has identifies it. For example, every _______ atom has 79 protons, no exception. If you have an atom with 80 protons, it is no longer ______, but ______________. Thus, the number of protons is called the ___________________—it identifies the atom. Atoms that differ only by number of electrons are called ________. Atoms that differ only by number of neutrons are called ______________. Isotopes differ by the number of neutrons in the nucleus, so the _______ ________ differs among isotopes. The mass number is the sum of the number of protons (atomic number) plus the number of neutrons in an atom. Isotopes may be distinguished by their mass numbers. The symbol and abbreviations are written: Examples: How many protons, neutrons, and electrons are in an atom of 197 Au? Hydrogen has three isotopes, with mass numbers 1, 2, 3. Write the complete chemical symbol for each atom.
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Walker CH304k Chap 7 Part 2 Page 2 of 7 Isotopic Abundance and Atomic Weight The various isotopes of a given element weigh different amounts, based on each atom’s number of neutrons. Many isotopes occur in nature, to different extents. Because a sample of a pure element may include these isotopes, its weight may
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Nuclear_part2_3 - Walker CH304k Chap 7 Part 2 Nuclear...

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