+1 - Relative charge of a proton, -1 - Relative charge of an electron, 0 - Relative charge of a neutron, 0 (Negligible) - Relative mass of an electron, 1 - Relative mass of a proton or a neutron, Nucleon number - The total number of protons and neutron in an atom, Cation - Positively charged ion, Anion - Negatively charged ion, Ion - An atom that has released or gained electrons, Isotopes - Atoms of the same element with the same proton number but different neutron number,

Atomic Structure - Common Terms

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