What does 1s, 2s, 2p, 3s, 3p mean?
ChemistryClass 11CBSEAnswered 20 May 2026
Answer
| Notation | Shell | Subshell | Max Electrons |
|---|---|---|---|
| 1s | 1st | s (spherical) | 2 |
| 2s | 2nd | s | 2 |
| 2p | 2nd | p (dumbbell) | 6 |
| 3s | 3rd | s | 2 |
| 3p | 3rd | p | 6 |
Number = energy level (shell) | Letter = subshell type.
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