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  4. The coordination number of a central metal atom in a complex is determined by

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Q. The coordination number of a central metal atom in a complex is determined by

AIEEEAIEEE 2004Coordination Compounds

Solution:

The co-ordination number of a central metal atom in a complex is determined by the number of ligands around a metal ion bonded by sigma bonds. It is also define as the number of atoms, ions, or molecules that a central atom or ion holds as its nearest neighbors in a complex. For example, in $Ni ( CO )_{4}$, four carbonyl ligands are bonded to Ni atom. Hence, the coordination number of $Ni$ in $Ni ( CO )_{4}$ is four.