The outer electronic configuration of Gd (Atomic No: 64) is:

4f⁸ 5d⁰ 6s²

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4f⁴ 5d⁴ 6s²

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4f⁷ 5d¹ 6s²

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4f³ 4d⁵ 6s²

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Solution

The correct option is C 4f⁷ 5d¹ 6s²
Gadolinium $(X_{6} 4 G d) = [X e]^{54} 4 f^{7} 5 d^{1} 6 s^{2}$ .

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