Question

why d block emement show variable oxidation state​

Answer 1

Answer:

These elements show variable oxidation state because their valence electrons in two different sets of orbitals, that is (n-1)d and ns. The energy difference between these orbitals is very less, so both the energy levels can be used for bond formation. Thus, transition elements have variable oxidation states.

Answer 2

These elements show variable oxidation state because their valence electrons are in two different sets of orbitals, which are (n-1)d and ns.

The energy difference between these orbitals is very less, so both the energy levels can be used for bond formation. Thus, transition elements have variable oxidation states, which means, electrons both in d and s shell are ready to combine with other atoms