MHT CET 2022 Chemistry question

Which element from following has half filled f orbital in +3 oxidation state?

(A)U (Z = 92)
(B)Lr (Z = 103)
(C)Cm (Z = 96)Correct
(D)Th (Z = 90)

Answer: (C)

Solution

Half-filled f subshell means for the actinoids. Cm (Z = 96) has the configuration ; on forming the +3 ion it loses the and electrons, leaving : , a half-filled f subshell

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Question ID VK-093540