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Q.

Electronic configuration of divalent cation of Eu is

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a

4f6

b

5f7

c

4f7

d

5f8

answer is B.

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Detailed Solution

63Eu = [Xe]4f76s2

63Eu+2 = [Xe]4f76s0 

so the Electronic configuration of di valent cation is 4f7 6s0

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Electronic configuration of divalent cation of Eu is