Use your brain power Coordination number used
in coordination of compounds in
somewhat different than that used in
solid state. Explain

For molecules and polyatomic ions the coordination number of an atom is determined by simply counting the other atoms to which it is bonded (by either single or multiple bonds).For example, − has Cr3+ as its central cation, which has a coordination number of 6 and is described as hexacoordinate. The common coordination numbers are 4, 6 and 8.

increased stability in the completion of fluorine's outer shell.