Electron Configuration of Aluminium (Al)
Aluminium (Al, Z = 13) has the electron configuration [Ne] 3s^2 3p^1, filling 3 shells with 2, 8, 3 electrons.
This is the fast lane: one page, one fact, zero digressions. Read the quick answer, check the table, and if your exam needs the full derivation, the sections below walk through it step by step — in Bangla and English, like every page here. Need the whole picture instead — history, characteristics, uses, exam questions? The full Aluminium page is one click away.
Aluminium: every subshell, one by one
The table below unpacks [Ne] 3s^2 3p^1 line by line, so you can watch Aluminium's 13 electrons take their seats in order of increasing energy.
| Subshell | Electrons | Total so far |
|---|---|---|
| [Ne] | 0 | 10 |
| 3s | 2 | 12 |
| 3p | 1 | 13 |
Electrons per shell (K, L, M…)
Grouped by principal quantum number instead of subshell, Aluminium carries 2 in shell 1, 8 in shell 2, 3 in shell 3. The outermost shell holds 3 electrons — the ones that do all the bonding.
How to derive it yourself
Follow the aufbau order (1s → 2s → 2p → 3s → 3p → 4s → 3d → …), pouring 13 electrons into orbitals of capacity 2 (s), 6 (p), 10 (d) and 14 (f) until none remain. Write the filled inner shells as the nearest noble-gas core — for Aluminium that gives [Ne] 3s^2 3p^1.
Students also ask
How many electron shells does Aluminium have?
Aluminium is in period 3, so its electrons occupy 3 shells, holding 2, 8, 3 electrons respectively.
How many valence electrons does Aluminium have?
Its outermost shell holds 3 electrons, so Aluminium has 3 valence electrons that take part in bonding.
What is the noble-gas shorthand for Aluminium?
The shorthand form is exactly [Ne] 3s^2 3p^1.