1.

Use Hund's urle to derive the electronic configuration of Ce^(3+) ion and calculate its magnetic moment on the basis of spin only formul .

Answer»

Solution :`._(58)Ce= [Xe]^(54) 4f^(1) 5d^(1) 6s^(2)`
`Ce^(3+) = [Xe]^(54) 4f^(1) , i.e., `THEREIS only ONE unpaired electron, i.e., `n=1`. Hence,
`mu = SQRT(n(n+2)) BM = sqrt(1( 1+2)) = sqrt( 3) BM= 1.73BM`


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