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6 Cards in this Set

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ion
an atom that has a positive or negative charge because it has unequal numbers of protons and electrons
ionization
the process of giving up or gaining electrons
molecule
the resulting combination when two or more atoms share electrons; O2
compound
a substance that contains atoms of two or more different elements; H2O, NaCl
free radical
an electrically charged atom or group of atoms with an unpaired electron in the outermost shell--unstable, highly reactive, and destructive to nearby molecules
antioxidants
substances that inactivate oxygen-derived free radicals: selenium, zinc, beta-caroten, and vitamins C and E