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Chemistry-

General

Easy

Question

Which of the following ions has the least magnetic moment

$C u^{+ 2}$
$N i^{+ 2}$
$C o^{+ 3}$
$F e^{+ 2}$

The correct answer is: $C u to the power of plus 2 end exponent$

$C u to the power of plus 2 end exponent$
S.NoIonElectronic configurationNo. of unpaired electrons
(i) $C u to the power of plus 2 end exponent$ $d to the power of 9 end exponent$ 1
(ii) $N i to the power of plus 2 end exponent$ $d to the power of 8 end exponent$ 2
(iii) $C o to the power of plus 2 end exponent$ $d to the power of 7 end exponent$ 3
(iv) $F e to the power of plus 2 end exponent$ $d to the power of 6 end exponent$ 4
$mu equals square root of n left parenthesis n plus 2 right parenthesis end root$ (magnetic moment)
$mu proportional to square root of n$
$C u to the power of plus 2 end exponent$ there is only 1 unpaired electron so its magnetic moment is least.

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