Coordination number has to do with the number of ligands that is attched to the central metal atom/ion.
What is coordination number?
The term coordination number has to do with the number of ligands that is attched to the central metal atom/ion. The coordination sphere contains this central metal along with associated ligands.
The question is incomplete. However, if I have something like, K3[Cr(H2O)6], the coordination number of the complex is six.
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