NEET | 2016Atomic StructureHard

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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