Coordination number of a central metal atom in a complex is determined by

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the number of ligands around a metal ion bonded by dative bonds

the number of only anionic ligands bonded to the metal ion

the number of ligands around a metal ion bonded by ionic bonds

the number of ligands around a metal ion bonded by covalent bonds

answer is A.

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Detailed Solution

Explanation:

By counting the number of sigma bonds to the metal atom, we may calculate the coordination number.
The number of ligands around a metal ion that are connected by sigma bonds is the coordination number.
Since 1 sigma bond equals 1 ligand, pi bonds are not taken into account when calculating the coordination number.

Hence, the correct answer is (A) the number of ligands around a metal ion bonded by dative bonds

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