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The 7th edition of the textbook states on page 725 that "some ligands are polydentate ("many toothed") and can occupy more than one binding site simultaneously," This is because they have one or more extra lone pairs of electrons that can be used to bind to the central metal atom. An example of a polydentate ligand would be the bidentate ethylenediamine molecule NH2CH2CH2NH2 that has a Nitrogen with a lone pair of electrons that is bound to the central metal atom in another location.
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