Question

What is coordination number ?

Answer 1

$\huge\star\underline\mathfrak\red{Answer}$

Coordination number, also called Ligancy, the number of atoms, ions, or molecules that a central atom or ion holds as its nearest neighbours in a complex or coordination compound or in a crystal. ... Coordination numbers from 2 to 9 have been observed in complexes; higher coordination numbers occur, although rarely.

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Answer 2

$\huge\underline\blue{\sf Co-ordination\: Number}$

The number of ligands that combine with the central atom to from the complex ion is called coordination number.

From every ligand central metal accept lone pair of Electron.