" For the configucation 1S^(2)2S^(1) ,th...

" For the configucation `1S^(2)2S^(1)` ,the quantum numbers for the outermost electron are "

A

`2,1,0,-1//2`

B

`2,0,0, +1//2`

C

`2,1,0,+1//2`

D

`2,0,1,+1//2`

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`n=2 , l = 0 , m_s = pm 1//2`

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