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Last updated 1:06 AM on 6/9/26
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7 Terms
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atomic mass
the number of protons and neutrons in an atom
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relative atomic mass (Ar)
the average mass of an atom compared to the mass of 1/12 of a carbon atom
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relative molecular/formula mass (Mr)
the sum of relative atomic masses of the atoms in a molecule or ‘species’
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mole
the amount of substance that contains the same number of particles as there are atoms in 12g of a carbon-12 atom
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molar mass
the mass of one mole of a substance (g/mol)
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empirical formula
the simplest whole number ratio of atoms of each element in a formula (compound)
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molecular formula
the actual number of atoms of each element in the formula of a compound