MHT CET 2026 Chemistry question

What is the total number of transition series of d-block elements?

(A)3Correct
(B)4
(C)10
(D)12

Answer: (A)

Solution

The d-block elements (groups 3 to 12) are arranged in three complete transition series, the 3d series (Sc to Zn), the 4d series (Y to Cd) and the 5d series (La, Hf to Hg), in which the 3d, 4d and 5d subshells are progressively filled. The fourth (6d) series beginning with Ac is incomplete, as

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Question ID VK-100409