A) the same effective nuclear charge
B) partially filling of f and d-orbitals
C) the imperfect shielding on outer electrons by 4f-electrons from the nuclear charge
D) the perfect shielding on outer electrons by 4f-electrons from the nuclear charge
Correct Answer: C
Solution :
Lanthanoid contraction is due to poor shielding of electrons of 4f-orbital. It is even less than the shielding shown by d-electron.
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