ion - an atom that has lost or gained an electron, cation - ion with a positive charge, anion - ion with a negative charge, electron - subatomic particle with a negative charge, proton - subatomic particle with a positive charge, neutron - subatomic particle with no charge, molecule - neutral group of atoms held together with covalent bonds, compound - substance made of two or more substances, atom - the smallest unit of an element , nucleus - part of the atom made of proton and neutrons,

Chemistry: Atoms and Molecules

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