Given electronic configuration ( $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{4}$ ) is shown by :

C r

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M n

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M o

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S

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S e

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Solution

The correct option is A $C r$
Given electron configuration $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{4}$ is shown by chromium (Cr).
The atomic number of Cr is 24. The expected electronic configuration is $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{4}$ .
The observed electronic configuration is $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{1} 3 d^{5}$ . It indicates extra stability of half filled orbitals.

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Similar questions

C r^{2 +}

M n^{3 +}

C r^{2 +}

M n^{3 +}

C r^{2 +}

M n^{3 +}

d^{4}

Write down the electronic configuration of

$C r^{3 +}$

$P m^{3 +}$

$C u^{+}$

$C e^{4 +}$

$C o^{2 +}$

$L u^{2 +}$

$M n^{2 +}$

$T h^{4 +}$

[A r] 3 d^{5}

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