Periodic System for Chemists
Table
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

Related Elements

Category

Transition Metals

Same Group

29 Cu Copper47 Ag Silver79 Au Gold

Same Period

108 Hs Hassium109 Mt Meitnerium110 Ds Darmstadtium112 Cn Copernicium113 Nh Nihonium114 Fl Flerovium

Periodic Trends

Electronegativity →Atomic Radius →Density →Melting Point →