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6 Terms
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Atomic Number
Number of protons in the nucleus
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Mass Number
Number of protons and neutrons in the nucleus
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Isotope
Atoms with the same number of protons (same element) but different numbers of neutrons
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Ions
Atom(s) that have gained/lost electrons, so their number of electrons and protons are different, and therefore carries charge
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Relative Isotopic Mass
Mass of an atom of an isotope compared to 1/12 of the mass of a carbon-12 atom
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Relative Atomic Mass
Weighted mean mass of an atom of an element compared to 1/12 of the mass of a carbon-12 atom
Note 
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