A) d-block elements show irregular and erratic chemical properties among themselves
B) La and Lu have partially filled d orbitals and no other partially filled orbitals
C) The chemistry of various lanthanoids is very similar
D) 4f and 5f orbitals are equally shielded
Correct Answer: D
Solution :
4f and 5f belongs to different shell, therefore experience different amount of shielding.
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