Question

Explain Lanthanide contraction with reason.

Hint:

Lanthanide contraction affects the properties of transition elements, reducing size variation.

Answer 1

Step 1: Definition:
Lanthanide contraction refers to the gradual decrease in atomic and ionic radii of lanthanides across the series due to poor shielding by f-electrons. Step 2: Reason:
- Poor shielding increases effective nuclear charge, pulling electrons inward.