Ion - An atom that has lost or gained electrons, Isotope - An atom that has the same number of protons and electrons but a different number of neutrons in the nucleus, Ionic - Bonding between a metal and a non-metal, Covalent - Bonding between two non-metals, Metallic - Bonding in metals , Mass number - The mass of the protons and neutrons in an atom of an element, Atomic number - The number of protons in an atom of an element, Bond - The attraction between atoms,

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