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The electrons in a poly -electronic atom...

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`

Text Solution

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The correct Answer is:
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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P BAHADUR-ATOMIC STRUCTURE-Exercise 7
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