Question

Why is actinoid contraction greater than lanthanoid contraction?

Answer 1

Answer:

Actinoid contraction is greater from element to element than lanthanoid contraction. ... 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 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.