NEET | 2016Atomic StructureEasy

Question

The electronic configurations of Eu (Atomic no. 63), Gd (Atomic NO. 64) and Tb (Atomic No. 65) are:

Options

A.

[Xe]4f7 6s2, [Xe]4f8 6s2 and [Xe]4f8 5d1 6s2

B.

[Xe]4f6 5d1 6s2, [Xe]4f7 5d1 6s2 and [Xe]4f9 6s2

C.

[Xe]4f6 5d1 6s2, [Xe]4f7 5d1 6s2 and [Xe]4f8 5d1 6s2

D.

[Xe]4f7 6s2, [Xe]4f7 5d1 6s2 and [Xe]4f9 6s2

Solution

Eu - [Xe]4f7, 6s2
Gd - [Xe]4f7, 5d1, 6s2
T6 - [Xe]4f9, 6s2

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