Statement: I- Coordination entity and coordination polyhedra are synonymous.Statement:II– Coordination number of central metal ion is the sum of sigma and Pi bonds present between central metal ion and ligands.

I)   K4FeCN6- Coordination entity is the species present in the square bracket i.e., it includes Fe+2 and 6CN– ions.     Coordination polyhedra is the spatial arrangement of various ligands around central metal ion which gives the geometry of  the complex.II)  Coordination number of central metal ion is the total number of sigma bonds formed by it with the surrounding ligands.