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An electron that is found in the outermost shell of an atom and that determines the atom's chemical properties
A law that states the repeating chemical and physical properties of an element change periodically with the atomic numbers of the element
An atom or group of atoms that has lost or gained one or more electrons and as a negative or positive charge
An atom that has the same number of protons as other atoms of the same element do but has a different number of neutrons
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