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In which of the following orbitals , the...

In which of the following orbitals , the sum of `( n+1)` value is lowest ?
`4s, 3d, 4p`

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`4s to n=4 , i=0 , (n+1)=4`
` 3d to n=3 l=2 , (n+l) =5`
` 4p to n=4 , l=1 , (n +l ) =5`
Therefore 4s - orbital is lowest is energy .
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