Question

actinoid contraction is greater than lanthanoid contraction meritnation

Answer 1

CERTIFIED ANSWER. In actinoids the 5f orbitals are filled. ... 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

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.