What is the denticity of the chelating ligand EDTA (ethylenediaminetetraacetate) when it fully complexes with a metal ion like ?

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Question

What is the denticity of the chelating ligand EDTA (ethylenediaminetetraacetate) when it fully complexes with a metal ion like $Ca^{2+}$?

Prashant Kotian · Accepted Answer

Correct answer: 6. EDTA has 2 nitrogen donor atoms and 4 oxygen donor atoms (from the four acetate groups). When it fully wraps around a central metal ion, it donates 6 lone pairs, making it a hexadentate ligand.

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