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What is the maximum degeneracy of a level of H-atom, where `e^(-)` has energy, `E_(n) =- (R)/(9)`?

Text Solution

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`E_(n)=-(R_(H))/(n^(2))=-(R_(H))/(9)`
`thereforen=3`
Thus l=0 and m=0 (one 3s-orbitals)
l=2 and m=-2,-1,0+1,+2 (five 3d-orbitals)
Thus, degeneracy is nine `(1+3+5=9" states")`.
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