unit 1 Definitions 0.0 / 5 ? ChemistryDefinitionsASAQA Created by: snoble32Created on: 21-02-15 14:51 Mass number Sum of the protons and neutrons in the nucleus of an atom 1 of 5 Atomic Number number of protons in the nucleus of an atom 2 of 5 Isotope atoms with the same proton number but different number of neutrons 3 of 5 Empirical formula Simplest whole number ratio of the atoms of each element in a compound 4 of 5 molecular formula actual number of each element in a molecule 5 of 5
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