Periodic System for Chemists

all the data in one app

111

281.00

Rg

Roentgenium

Identification

CAS Number: 54386-24-2

Discovery Year: 1994

Discoverer: Heavy Ion Research Laboratory (HIRL)

Discovery Location: Germany

Properties

Atomic Mass: 281 →Density: 28.7 g/cm³ →

Electronic Structure

Electron Config: [Rn] 5f14 6d10 7s1

Block: d

Period: 7 →Group: 11 →

Abundance & Geochemistry

Goldschmidt Class: synthetic

About

Element 111

Isotopes

Rg-281 281 ☢ 37.0 s

Rg-282 282 ☢ 1.90 s