If the value of `n+l = 7` then what should be the increasing order of energy of the possible sub -shells ?

Explanation

To determine the increasing order of energy of the possible sub-shells when \( n + l = 7 \), we can follow these steps:

### Step 1: Identify the possible values of \( n \) and \( l \)
Given \( n + l = 7 \), we can find the possible pairs of \( n \) and \( l \) values. Remember that \( l \) must be less than \( n \).

- For \( l = 0 \) (s orbital):
- \( n + 0 = 7 \) → \( n = 7 \) → Subshell: \( 7s \)

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