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Anion
An anion is formed when an atom gains one or more electrons, resulting in a net negative charge.
Cation
A cation is formed when an atom loses one or more electrons, resulting in a net positive charge.
Ion
An ion is an atom or group of atoms that has gained or lost electrons, resulting in a net electrical charge.
Nucleus
A nucleus is a dense, positively charged core that contains protons and neutrons, collectively called nucleons.