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 fo 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 element which has as many as `s` electrons as (p) electrons by belong to (III) period is ?A. `O`B. `Mg`C. `Al`D. `C`

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 fo 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 element which has as many as `s` electrons as (p) electrons by belong to (III) period is ?A. `O`B. `Mg`C. `Al`D. `C`
Answer» Correct Answer - B `._(12) Mg:1s^2 , 2s^2 2p^6 , 3s^2`.

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