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  4. For a transition metal ion having seven electrons in its d-orbital the effective magnetic moment will be

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Q. For a transition metal ion having seven electrons in its d-orbital the effective magnetic moment will be

The d-and f-Block Elements

Solution:

If d-orbital contains 7-electrons, it has 3 unpaired electrons.
$\therefore \quad\mu = \sqrt{n\left(n+2\right)} = \sqrt{3\left(3+2\right)} = \sqrt{3\times5} = \sqrt{15}$
$= 3.87\, B.M.$