Question

Why group 12 are not regarded as a transition metals?

Answer 1

First question arises what are transition metals?

Ans.Transition metals are those metals who have partially filled d-orbital means not fully filled.

But In group 12 elements zn,Cd and Hg have fully filled d-orbital.

That's why they are not considered as transition metals.

Answer 2

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.Transition metals are those metals who have partially filled d-orbital means not fully filled.

But In group 12 elements zn,Cd and Hg have fully filled d-orbital.

That's why they are not considered as transition metals.

Zinc is not consider as a transition metal because its compounds or ions (Zn2+) contain a full filled d-orbital or sub shell and are unstable.Moreover it have only one ion which is the (Zn2+). Hence zinc do not form colored aqueous ions because it do not have at least one vacant d-orbital in which it can receive an electron in a reaction.

Considering Zinc not as a transition metal require you to understand and see into consideration the properties of transition metals . You can start with their ability to have variable oxidation state and their catalytic nature in reactions.

Here are some of the characteristic of a transition metal →

→ They form compound with variable oxidation states

→ They are good catalyst in most reactions

→ They exhibit para-magnetism

→ They form complexes

→ They form colored ions with compound.