| valence | <biochemistry> The number of binding sites on a molecule. <chemistry> A number which reflects an element's ability to combine with other elements <immunology> The number of antigen binding sites an antibody has, or the number of antigenic determinants an antigen has (09 Oct 1997) |
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| valence electron | One of the electron's that take part in chemical reactions of an atom. (05 Mar 2000) |