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Use Hund's rule to derive the electronic...

Use Hund's rule to derive the electronic configuration of `Ce^(3+)` ion, and calculate its magnetic moment on the basis of 'spin only formula

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`Ce(Z = 58) = [Xe] 4f^(1) 5d^(1) 6s^(2)`
`Ce^(3+) = [Xe] 4f^(1)` (Only one unpaired electron)
Magnetic moment of `Ce^(3+) (mu) = sqrt(n(n+2))` `= sqrt(1(1 + 2)) = sqrt(3) = 1.73BM`.
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