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Chemistry Question on d -and f -Block Elements

For a metal ion, the calculated magnetic moment is 4.90 BM. This metal ion has ______ number of unpaired electrons.

Answer

The magnetic moment of a complex is 4.9 B.M. Thus, unpaired electrons maybe 4. The expression for the magnetic moment is μ= n(n+2)\sqrt{n(n+2)}
​Substitute values in the above expression.
4.9= n(n+2)\sqrt{n(n+2)}
​24.01=n(n+2)
⇒ n=4.

So, the correct answer is 4.