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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 bond that forms when electrons are transferred from one atom to another, which results in a positive ion and negative ion
a charged particle that forms when an atom or group of atoms gains or loses one or more electrons
the smallest unit of a substance that keeps all of the physical and chemical properties of that substance
a bond formed by the attraction between positively charged metal ions and the electrons around them
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