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7 Cards in this Set
- Front
- Back
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atomic number |
the number of protons in an atom of an element |
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Isotopes |
atoms of the same element that have different numbers of neutrons |
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mass number |
the sum of the number of protons and neutrons in an atom |
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average atomic mass |
is the average mass of the element's isotopes, weighted according to the abundance of each isotope |
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radioactive |
elements that sponateously emit radiation |
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nuclear decay |
the process that occurs when an unstable atomic nucleus changes into another more stable nucleus by emitting radiation. |
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ions |
is an atom that is no longer neutral because it has gained or lost electrons. |
