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Chem – Atoms, Molecules & Ions Essay Preview: Chem – Atoms, Molecules & Ions Report this essay CHEM 1 REVIEW: Atoms, molecules & IonsProtons: +1Electrons: -1Neutrons: no chargeGenerally, there is the same number of protons as electrons in an atom (to balance it).The mass number is equal to the number of protons and the number.