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CFSE in Octahedral and Tetrahedral Complexes

Which of the ...

Question

Which of the following is the correct configuration of chromium atom in ground energy state?

[A r] 3 d^{5} 4 s^{1}

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[A r] 3 d^{4} 4 s^{2}

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[A r] 3 d^{6} 4 s^{0}

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[K r] 4 d^{5} 5 s^{1}

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Solution

The correct option is B $[A r] 3 d^{5} 4 s^{1}$
Atomic no. of Cr = 24
E.C = $[A r] 3 d^{5} 4 s^{1}$ & not $[A r] 3 d^{4} 4 s^{2}$ because half filled $3 d^{5}$ is more stable than corresponding $4 s^{2}$ .

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