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What is the general electronic configuration of d-block elements?(a) (n-1)d^1-10ns^0-2(b) ns^2np^1-6(c) (n–2)f^1–14(n–1)d^0–10ns^2(d) ns^1-2This question was addressed to me during an online interview.The doubt is from Position of the Periodic Table topic in division D and F-Block Elements of Chemistry – Class 12

Answer»

Correct choice is (a) (n-1)d^1-10ns^0-2

Easiest explanation: D-block elements are so-called since, in them, 3d, 4d, 5d and 6d subshells are incomplete and the last electron ENTERS the (n-1)d orbital, i.e., penultimate (last but ONE) shell. Their GENERAL ELECTRONIC configuration is (n-1)d^1-10ns^0-2, where n is the outermost shell.



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