Which one of the following represents a d-block element?

[R n] {6 d}^{10} {7 s}^{2} {7 p}^{2}

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[X e] {4 f}^{1} {5 d}^{1} {6 s}^{2}

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[X e] {4 f}^{14} {5 d}^{1} {6 s}^{2}

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[X e] {5 d}^{1} {6 s}^{2}

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Solution

The correct option is D $[X e] {5 d}^{1} {6 s}^{2}$
Solution:- (D) $[X e] 5 d^{1} 6 s^{2}$
The electronic configuration of d-block elements is $(n - 1) d^{1 - 10} n s^{1 - 2}$ .
Hence, $[X e] 5 d^{1} 6 s^{2}$ represnts a d-block element.

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