CBSE Class 12 · 2000 · All India; also Foreign · d and f Block ElementsVery Short Answer

Transition metals are known to form interstitial compounds. The formation of interstitial compounds makes the transition metal:

Assertion (A): Zr and Hf have almost similar atomic radii.
Reason (R): This is due to lanthanoid contraction.

Which of the following ions has the electronic configuration 3d${}^6$? (Atomic numbers: Mn = 25, Co = 27, Ni = 28)

Which property of transition metals enables them to behave as catalysts?

(a) A transition element X has the electronic configuration [Ar]4s²3d³. Predict its likely oxidation states.

a) Write any two consequences of lanthanoid contraction.
b) Name the element of the 3d series which exhibits the largest number of oxidation states. Give a reason.