Solveeit Logo

Question

Chemistry Question on d -and f -Block Elements

Which of the following factors may be regarded as the main cause of lanthanide contraction ?

A

Greater shielding of 5d electron by 4f electrons

B

Poorer shielding of 5d electron by 4f electrons

C

Effective shielding of one of 4f electrons by another in the sub-shell

D

Poor shielding of one of 4f electron by another in the sub-shell

Answer

Poor shielding of one of 4f electron by another in the sub-shell

Explanation

Solution

Lanthanide contraction is due to poor shielding of one of 4f electron by another in the sub-shell.