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Which orbit of the following is lower in...

Which orbit of the following is lower in energy in a many electron atom ?

A

`2p`

B

`3d`

C

`4s`

D

`5f`

Text Solution

Verified by Experts

The correct Answer is:
A
According to `(n +1)` rule
For `2s , n = 2,l = 0`
`n + 1 = 2`
Similarly for `3d = (n + 1) = 3`
`4s = (4 + 0) = 4`
5f rarr 5f = (5 + 3) =-- 8`
`2s `is lower in energy
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