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Q.

Which gas phase atom in its ground state has exactly three unpaired electrons?

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a

$Sc$

b

$Co$

c

$Se$

d

$Fe$

answer is C.

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Detailed Solution

Here,

${Co}_{27} \to [A r] 3 d^{7} 4 S^{2}$

So Co has exactly three unpaired electrons in its ground state .

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