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12 Cards in this Set
- Front
- Back
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Atoms of the same element that differ in mass
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isotopes
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Isotopes have the same numbers of ___ but different numbers of _______.
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protons, neutrons
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The number of protons in an atom
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atomic number (represented by letter Z)
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A particular kind of atom containing a definite number of protons and neutrons
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nuclide
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The particles that make up the nucleus
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nucleons
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The total number of nucleons in an atom
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mass number (represented by letter A)
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The chemical symbol of an element can be written with the ______ as a superscript and the ________ as a subscript.
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mass number, atomic number
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Atoms are made of
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protons, neutrons, and electrons
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a helium nucleus that consists of two protons and two neutrons
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alpha particles
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a high speed electron emitted form radioactive nuclei
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beta particles
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very high energy X - rays
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gamma rays
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unstable nuclei that emit rays or particles to become stable are said to
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decay
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