MHT CET 2022 Chemistry question

Which among the following lanthanoids forms most stable +2 oxidation state?

(A)Eu (Z = 63)Correct
(B)Ce (Z = 58)
(C)Pm (z = 61)
(D)Gd (Z = 64)

Answer: (A)

Solution

The lanthanoids normally show the +3 state, but a few also show +2 when this gives a stable , or configuration. Europium () loses its two 6s electrons to give with the half-filled, extra-stable

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Question ID VK-093986