The coordination environment of $$Ca^{2+}$$ ion in its complex with $$EDTA^{4-}$$ is :

EDTA⁴⁻ is a hexadentate ligand that coordinates through 2 nitrogen atoms and 4 oxygen atoms (total 6 donor atoms).

Ca²⁺ complex with EDTA⁴⁻ has coordination number 6, forming an octahedral geometry.

The correct answer is Option 3: octahedral.

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