Ruthenium

Atomic symbol: Ru
Atomic number: 44
Atomic mass: 101.07

Appearance: Silvery white solid at 25°C

Group: 8
Period: 5
Series: Transition metals
Block: d
Electron configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d⁷ 5s¹

Inert, though some compounds are highly toxic.

Very rare metal used in electronics.

Fun Fact! Ruthenium is sometimes used in the nibs of Parker pens.