A) the appreciable shielding on outer electrons by\[4f\]electrons from the nuclear charge
B) the appreciable shielding on outer electrons by\[5d\]electrons from the nuclear charge
C) the same effective nuclear charge from\[Ce\]to\[Lu\]
D) the imperfect shielding on outer electrons by\[4f\]electrons from the nuclear charge
Correct Answer: D
Solution :
Lanthanoid contraction is due to ineffective shielding produced by larger r-subshell.
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