A) Poor shielding of one of \[4f\] electron by another in the subshell
B) Effective shielding of one of \[4f\] electrons by another in the subshell
C) Poorer shielding of \[5d\] electrons by \[4f\] electrons
D) Greater shielding of \[5d\] electron by \[4f\] electrons
Correct Answer: A
Solution :
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