According to ___________ theory, the metal atom or ion under the influence of ligands can use its (n-1)d, ns, np or ns, np,nd orbtials for hybridisation to yield a set of equivalent orbitals of definite geometry.

In octahedral complexes, the energy separation between the lg and t2g orbitals is denoted as

When several donar atoms are present in a single ligand then the ligand is said to be _______ ligand.

_________ theory is an electrostatic model which considers the metal- ligand bond to be ionic arising purely from electrostatic interactions between the metal ion and the ligand.

_________was the first to formulate his ideas about the structure of co-ordination compounds.

__________is the co-ordination number of the complex having tetrahedral geometry.

The ___________ of a metal ion in a complex can be defined as the number of ligand donor atoms to which the metal is directly bonded.

_________ valence are non ionisable

______________ of the central atom in a complex is defined as the charge it would carry if all the ligands are removed along with electron pair that are shared with the central atom.