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Q.

Which of the following has a maximum number of unpaired electrons?

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a

${Na}^{+}$

b

$N^{3 -}$

c

${Fe}^{3 +}$

d

${Cr}^{3 +}$

answer is C.

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Detailed Solution

The atomic number of $Fe$ is 26. Its electronic configuration [Ar] 3d⁶4s².

So, the electronic configuration ${Fe}^{3 +}$ ( by losing 3 electrons ) is $[A r] 3 d^{5}$ .

Hence, the option C is correct .

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