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Chemistry
Which of the following factors may be regarded as the main cause of lanthanoid contraction?
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Q. Which of the following factors may be regarded as the main cause of lanthanoid contraction?
MHT CET
MHT CET 2020
A
Greater shielding of $5 d$ electrons by $4 f$ electrons
B
Poorer shielding of $5 d$ electrons by $4 f$ electrons
C
Effective shielding of one of $4 f$ electrons by another in the subshell
D
Poor shielding of one of $4 f$ electron by another in the subshell
Solution:
In lanthanides, there is poorer shielding of $5 d$ electrons by $4 f$ electrons resulting in greater attraction of the nucleus over $5 d$ electrons and contraction of the atomic radii.