Question

Explain why
(a) Transition elements show high enthalpy of atomization
(b) Transition elements are good complexing agent
(c) Transition elements show variable oxidation state​

Answer 1

1. Transition elements have high effective nuclear charge and a large number of valence electrons. Therefore, they form very strong metallic bonds which results in high enthalpies of atomisation.

2. Transitional elements act as good catalysts in chemical reaction. In the hydrogenation Ni metal, In contact process of manufacture of SO, Pt and in manufacture of NH3 by Haber process Fe acts as catalyst. In the method of preparation O2 by heating KClO3 , MnO2 acts as catalyst.

3. 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.

its the answer..