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| Smallest unit of an element. |
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| composed of two or more elements |
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| the smallest unit of the compound; The ______ may also be defined as containing two or more atoms. |
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| in the nucleus; have a positive charge; number does not change |
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| Number of protons an element has |
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| in the nucleus; no charge; number may change |
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| orbit around the nucleus; have a negative charge; number can change |
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| Atoms of the same element which differ in the number of neutrons |
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| number of electrons in the outer most shell |
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| arrangement of electrons in the shells |
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| protons + neutrons ---- total of all particles in the nucleus |
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| for 2nd and 3rd shells: stable with 8 electrons |
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| Transfer of electrons from one atom to another, Achievement of stability in the outer shell, |
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| loss of one or more electrons; forms a positive ion. |
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| gain of one or more electrons; forms a negative ion |
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| Sharing of valence electrons between atoms to reach stability, shared in pairs. |
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