Valency of Radon (Rn)
The valency of Radon is 0 — its outer shell is already complete, so it neither loses nor gains electrons in ordinary reactions.
Teachers call it "one fact, fully handled" — exactly what this page does for Radon. The answer sits at the top in bold; scroll for the working, the shell-by-shell breakdown and the two questions students ask most. Need the whole picture instead — history, characteristics, uses, exam questions? The full Radon page is one click away.
Counting the valence electrons
From the configuration [Xe] 4f^14 5d^10 6s^2 6p^6, Radon's outermost shell carries 8 electrons. These are the electrons shown as dots in electron-dot diagrams — the hands Radon uses to hold other atoms.
Position check: Radon belongs to group 18 of the periodic table, period 6.
Valency vs valence electrons
Valence electrons are what you count (8 for Radon); valency is what the atom will do to complete its outer shell (0 here). Keep the two words straight and half the periodic-table chapter writes itself.
Students also ask
How do I find the valency of Radon from its group?
Radon sits in group 18; groups 13–17 follow valency = group − 10, giving 8 (though Radon also shows 0).
Why does Radon show a fixed valency?
Radon has 8 valence electrons and reaches a complete outer shell in one consistent way, so its valency stays fixed at 0.