Which statement about co-ordination number of a cation is true :

Options

A. Most metal ions exhibit only a single characteristic co-ordination number
B. The coordination number is equal to the number of ligands bonded to the petal atom
C. The co-ordination number is determined solely by the tendency to surround the metal atom with the same number of electrons as one of the rare gases
D. For most captions, the co-ordination number depends on the size, structure and charge of the ligands

Answer

D