Which of the following ions contains minimum number of unpaired electrons?

F e^{2 +}

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F e^{3 +}

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C o^{2 +}

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C o^{3 +}

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Solution

The correct option is B $C o^{2 +}$
Ion Atomic number
outer electronic configuration
Number of unpaired electrons
$F e^{2 +}$ 26
$3 d^{6}$ 4
$F e^{3 +}$ 26 $3 d^{5}$ 5
$C o^{2 +}$ 27 $3 d^{7}$ 3
$C o^{3 +}$ 27 $3 d^{6}$ 4
Hence, option $C$ is correct.

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F e^{3 +}, F e^{2 +}, F e^{+}

F e^{2 +}

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Ion	Atomic number	outer electronic configuration	Number of unpaired electrons
$F e^{2 +}$	26	$3 d^{6}$	4
$F e^{3 +}$	26	$3 d^{5}$	5
$C o^{2 +}$	27	$3 d^{7}$	3
$C o^{3 +}$	27	$3 d^{6}$	4