The electrons in a poly -electronic atom are filled one by one in roder fo increasing energy level . The enrgy fo subsgells and orientation depeds upon the values of three quantum numbers 9 i.e., n. l and m respectively derived from Schrodinger wave equation . The different orbitals fo a subsshells however possess same energy level and are called degenerater orbitals but their enrgy level charges in presenct of magentic field and the orbitals are non-degenerate . (A) spectral line is noticed it an electron jups form one level to tohere . the paramgnetic nature of eelment sis due to the presence of unpaired electron . The total mangetic moment fo ` Ni^(2)` ion is :A. ` sqrt(2) BM`B. `sqrt(8) BM`C. `sqrt(15) BM`D. ` sqrt(12)BM`

The electrons in a poly -electronic atom are filled one by one in rode

1.	The electrons in a poly -electronic atom are filled one by one in roder fo increasing energy level . The enrgy fo subsgells and orientation depeds upon the values of three quantum numbers 9 i.e., n. l and m respectively derived from Schrodinger wave equation . The different orbitals fo a subsshells however possess same energy level and are called degenerater orbitals but their enrgy level charges in presenct of magentic field and the orbitals are non-degenerate . (A) spectral line is noticed it an electron jups form one level to tohere . the paramgnetic nature of eelment sis due to the presence of unpaired electron . The total mangetic moment fo ` Ni^(2)` ion is :A. ` sqrt(2) BM`B. `sqrt(8) BM`C. `sqrt(15) BM`D. ` sqrt(12)BM`
Answer» Correct Answer - B `Ni^(2+) , 3d^8 i.e, n=2 ` unpaired eelctron s. Magnetic moment `= sqrt(n(n +2)) BM` ltbRgt ` = sqrt(2(2 +2)) = sqrt( 8)`.

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