1.

Calculate the magnetic moment of a divalent ion in aqueous soluiotn if its atomicnumber is 25.

Answer»

SOLUTION :`Z=25` is for Mn . Its E.C.` = [AR]^(18) 3d^(5) 4s^(2)` . E.C. of its divalent ION `= [ Ar]^(18) 3d^(5) `. Thus , it has 5 unpaired ELECTRONS.
`:. ` Magnetic moment `(mu) = sqrt(n(n+2)) ` B.M. `(or mu_(B)) = sqrt(5(5+2)) = 5.92 mu_(B)`


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