JEE Main Chemistry question

The properties of Zr and Hf are similar because

(A)Both belong to -block
(B)Both belong to same group of Periodic Table
(C)Both have similar radiiCorrect
(D)Both have same number of electrons

Answer: (C)

Solution

Hafnium, following the full lanthanide series, undergoes lanthanide contraction, leaving it with an atomic/ionic radius almost identical to that of zirconium directly above it in group 4. This near-identical size (not merely

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Question ID VK-147403