Valency of Roentgenium (Rg)
The valency of Roentgenium is 2 — it has 1 valence electron, and it loses them to complete its outer shell.
Looking for Roentgenium's valency without wading through a whole chapter? Here is the direct answer first, then the tables and derivations examiners want to see. Every number on this page comes from the same engine that powers the interactive table. Need the whole picture instead — history, characteristics, uses, exam questions? The full Roentgenium page is one click away.
Counting the valence electrons
From the configuration [Rn] 5f¹⁴ 6d¹⁰ 7s¹, Roentgenium's outermost shell carries 1 electron. For a d-block element the nearby inner "d" subshell can also lend electrons, which is where variable valency comes from.
Position check: Roentgenium belongs to group 11 of the periodic table, period 7.
Valency vs valence electrons
Valence electrons are what you count (1 for Roentgenium); 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 Roentgenium from its group?
Roentgenium sits in group 11; for this transition group the safe exam answer is its common valency, 2.
Why does Roentgenium show a fixed valency?
Roentgenium has 1 valence electron and reaches a complete outer shell in one consistent way, so its valency stays fixed at 2.