Valency of Aluminium (Al)
The valency of Aluminium is 3 — it has 3 valence electrons, and it loses them to complete its outer shell.
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.
Counting the valence electrons
From the configuration [Ne] 3s^2 3p^1, Aluminium's outermost shell carries 3 electrons. These are the electrons shown as dots in electron-dot diagrams — the hands Aluminium uses to hold other atoms.
Position check: Aluminium belongs to group 13 of the periodic table, period 3. For main-group elements in groups 13–18, a quick rule is valency = group number − 10, which gives 3 here.
Valency vs valence electrons
Valence electrons are what you count (3 for Aluminium); valency is what the atom will do to complete its outer shell (3 here). Keep the two words straight and half the periodic-table chapter writes itself.
Students also ask
How do I find the valency of Aluminium from its group?
Aluminium sits in group 13; groups 13–17 follow valency = group − 10, giving 3 (though Aluminium also shows 3).
Why does Aluminium show a fixed valency?
Aluminium has 3 valence electrons and reaches a complete outer shell in one consistent way, so its valency stays fixed at 3.