The electronic configuration of bivalent...

The electronic configuration of bivalent europium and trivalent cerium are: (atomic number: Xe=54, Ce=58, Eu=63)

A

`[Xe]4f^"2"6s^2 and [Xe]4f^"2"6s^2`

B

`[Xe]4f^7 and [Xe]4f^1`

C

`[Xe]4f^4 and [Xe]4f^9`

D

`[Xe]4f^2 and [Xe]4f^7`

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The correct Answer is:

B

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