Coordination number, also called Ligancy, thenumberof atoms, ions, or molecules that a central atom or ion holds as its nearest neighbours in a complex orcoordinationcompound or in a crystal. ...Coordination numbersfrom 2 to 9 have been observed in complexes; highercoordination numbersoccur,

Coordination number, also ligancy, the number of atoms, ions, or molecules that a central atom or iron holds as its nearest neighbours in a complex or coordination compound or in a crystal.

In coordination chemistry, the coordination number is the number of ligands attached to the central ion (more specifically, the number of donor atoms). Coordination numbers are normally between two and nine. The number of bonds depends on the size, charge, and electron configuration of the metal ion and the ligands.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.