Magnetic moment 2.83 BM is given by which of the following ions?
`"At. nos. Ti=22, Cr=24, Mn=25,Ni=28"`

Options

A. `Ti^(3+)`
B. `Ni^(2+)`
C. `Cr^(2+)`
D. `Mn^(2+)`

Answer

B

Explanation

Magnetic moment is given by `mu=sqrt(n(n+2))B.M`
Hence, n=number of unpaire electrons `implies2.83=sqrt(n(n+2))implies8.00=n^(-)+2n`
`implies n^(2)+2n-8=0`
`implies n^(2)+4n-2n-8=0`
`therefore (n+4)(n-2)=0impliesn=2" " [because n ne-4]`
Among the given ions:

Hence, `Ni^(2+)` possesses a magnetic moment of 2.83 B.M