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Atomic Structure ⢠Everything (all matter) is made of Atoms. ⢠Atoms: composed of subatomic particles â Neutrons: no electrical charge (0) â Protons: one positive charge (+) â Electrons: one negative charge (-) ⢠Nucleus: formed by protons and neutrons. Most of the mass of atom. ⢠Most of the volume of an atom occupied by electrons in orbit. 4