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8 Cards in this Set
- Front
- Back
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Model
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A schematic description of a system that accounts for its known properties.
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Nucleus
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The center of an atom, containing the protons and neutrons.
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Atomic number
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The number of protons in an atom.
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Mass number
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The sum of the numbers of neutrons and protons in the nucleus of an atom.
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Isotopes
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Atoms with teh same number of protons but different numbers of neutrons.
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Element
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A collection of atoms that all have the same number of protons.
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Radioactive isotope
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An atom with a nucleus that is not stable.
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Half-life
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The time it takes for half of the original sample of a radioactive isotope to decay.
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