Question

Determine the Oxidation State and the Coordination Number of the Transition Metal Ion in each of the following Complex Ions:

a) Ni(H2O)6^ 2+

b) Mn(CN)6 ^4-

c) CuCl4 ^2-

d) Cr(NH3)6 ^3+

Answer 1

In chemistry, crystallography and materials science the coordination number of a central atom in a molecule or crystal is the number of its near neighbours.

The oxidation state, often called the oxidation number, is an indicator of the degree ofoxidation (loss of electrons) of an atom in a chemical compound.

a) Ni(H₂O)₆²⁺

Oxidation State is given by

Oxidation State=+2

Coordination Number=6

b) Mn(CN)₆^4-

Oxidation State is given by

Oxidation State=+2

Coordination Number=6

c) CuCl₄^2-

Oxidation State is given by

Oxidation State=+2

Coordination Number=4

d) Cr(NH₃)₆³⁺

Oxidation State is given by

Oxidation State=+3

Coordination Number=6