Ruthenium

Transition Metal

Atomic Number: 44 • Atomic Mass: 101.0700 u • Period: 5 • Group: 8

Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s¹ 4d⁷

Phase: Solid

Electronegativity: 2.2

History

Ruthenium has been known since ancient times

Discovered by Karl Ernst Claus at Kazan University, Russia

Isolated from platinum ore residues

Named in honor of Russia, where it was discovered