Valency of Beryllium (Be)
The valency of Beryllium is 2 — it has 2 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 Beryllium page is one click away.
Counting the valence electrons
From the configuration [He] 2s^2, Beryllium's outermost shell carries 2 electrons. These are the electrons shown as dots in electron-dot diagrams — the hands Beryllium uses to hold other atoms.
Position check: Beryllium belongs to group 2 of the periodic table, period 2.
Valency vs valence electrons
Valence electrons are what you count (2 for Beryllium); valency is what the atom will do to complete its outer shell (2 here). Keep the two words straight and half the periodic-table chapter writes itself.
Students also ask
How do I find the valency of Beryllium from its group?
Beryllium sits in group 2; groups 1–2 metals have valency equal to the group number — 2 here.
Why does Beryllium show a fixed valency?
Beryllium has 2 valence electrons and reaches a complete outer shell in one consistent way, so its valency stays fixed at 2.