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How Would You Account for the Following : Actinoid Contraction is Greater than Lanthanoid Contraction. - CBSE (Science) Class 12 - Chemistry

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Questions

How would you account for the following : Actinoid contraction is greater than lanthanoid contraction.

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

Solution

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

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 NCERT Solution for Chemistry Textbook for Class 12 (2018 to Current)
Chapter 8: The d-block and f-block Elements
Q: 10 | Page no. 232

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Solution How Would You Account for the Following : Actinoid Contraction is Greater than Lanthanoid Contraction. Concept: F-block Elements - The Actinoids.
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