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Aufbau Principle

The electroni...

Question

The electronic configuration of $C o^{2 +}$ and $C u^{2 +}$ is $d^{7}$ and $d^{9}$ respectively,which of these ions is expecteed to be more paramagnetic ?

A

C o^{+ 2}

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B

C u^{2 +}

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C

Both have same

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D

None of these

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Solution

The correct option is A $C o^{+ 2}$
As we know,
$μ = \sqrt{n (n + 2)}$
where n = no of unpaired electron.
$C o^{+ 2}$ = more paramagnetic $d^{7}; n = 3$
$C u^{+ 2} = d^{9}; n = 1$

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