Atomic symbol: Rg
Atomic number: 111
Atomic mass: 282

Appearance: Silvery solid at 25°C

Group: 11
Period: 7
Series: Transition metals
Block: d
Electron configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 4f¹⁴ 5d¹⁰ 6s² 6p⁶ 5f¹⁴ 6d⁹ 7s²

Roentgenium is predicted to have similar properties to copper, silver, and gold.

A superheavy, transactinide, radioactive and synthetic metal.

Fun Fact! An ode to its radioactive properties, roentgenium was named in honor of Wilhelm Conrad Rontgen, the physicist who discovered X-rays a century earlier in 1895.