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The correct enegry value order is...

The correct enegry value order is

A

`ns, np, nd, (n - 1)f`

B

`ns, np, (n -1)d, (n -2)f`

C

`ns, np, (n - 1)d, (n - 1)f`

D

`ns, (n - 1)d, np (n - 1)f`

Text Solution

Verified by Experts

The correct Answer is:
D
Considering the minimum value of `n` for the existence of the `f` subshell, we have
`(1) rArr 5s, 5p, 5d, 4f (2) rArr 6s, 6p, 4d, 4f`
`(3) rArr 5s, 5p, 4d, 4f (4) rArr 5s, 4d, 5p, 4f`
According to the `(n+l)` rule, lower `(n +l)` implies lower energy, and if `(n +l)` is same, then lower `n` implies lower enegry. Therefore, teh correct enegry value order is
`5s lt 4d lt 5p lt 4f`
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