Question

Why lanthanoid contraction r greater than actinoid contraction?

Answer 1

Explanation:

Actinoid contraction is greater from element to element than lanthanoid contraction.These five orbitals have a poorer shielding effect than fourth orbitals //in lanthanoids//. Thus, the effective nuclear charge experienced by electrons in valence shells in case of actinoids is much more that than experienced by lanthanoids.

Answer 2

Answer:

• In actinoids, 5f orbitals are filled.
• These 5f orbitals have a poorer shielding effect than 4f orbitals (in lanthanoids).
• Thus, the effective nuclear charge experienced by electrons in valence shells in case of actinoids is much more that that experienced by lanthanoids.
• Hence, the size contraction in actinoids is greater as compared to that in lanthanoids.