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5 Cards in this Set
- Front
- Back
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Atom |
the basic unit of a chemical element. |
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Atomic number |
the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table. |
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Atomic mass |
the mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes. |
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Mass number |
mass number (A), also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus. |
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Isotopes |
any of two or more forms of a chemical element, having the same number of protons in the nucleus, or the same atomic number, but having different numbers of neutrons in the nucleus, or different atomic weights |
