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Bohr's Model of a Hydrogen Atom

The electroni...

Question

The electronic configuration of chromium in ground state is:

[Ar] 3d

^{4}

^{1}

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[Ar] 3d

^{5}

^{1}

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[Ar] 3d

^{6}

^{2}

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[Ar] 3d

^{7}

^{2}

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Solution

The correct option is B [Ar] 3d $^{5}$ 4s $^{1}$
The configuration of chromium atom in ground state is [Ar] 3d $^{5}$ 4s $^{1}$ .

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\begin{matrix} S c - [A r] 3 d^{1} 4 s^{2} & C a - [A r] 4 s^{2} M g - [N e] 3 s^{2} & C o - [A r] 3 d^{7} 4 s^{2} \end{matrix}

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