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Question

The electronic configuration of bivalent Europium and trivalent Cerium, are: (Atomic Number : Xe=54,Ce=58,Eu=63)


A

[Xe]4f7,[Xe]4f1

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B

[Xe]4f76s2,[Xe]4f26s2

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C

[Xe]4f2,[Xe]4f7

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D

[Xe]4f4,[Xe]4f9

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Solution

The correct option is A

[Xe]4f7,[Xe]4f1


Explanation of the correct option:

The correct answer is option A:

The atomic number of Cerium is 58 and Europium is 63.

The electronic configurations of bivalent europium and trivalent cerium are,

Ce(58):[Xe]6s24f2(g.s)Ce3+:[Xe]4f1Eu(63):[Xe]6s24f7(g.s)Eu2+:[Xe]4f7

Hence, option A is correct.
The electronic configuration of bivalent europium and trivalent cerium, are [Xe]4f7,[Xe]4f1.


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