Ruthenium (Ru)

From Wikipedia, the free encyclopediaRuthenium is a chemical element with symbol Ru and atomic number 44. It is a rare transition metal belonging to the platinum group of the periodic table. Like the other metals of the platinum group, ruthenium is inert to most other chemicals.

Ruthenium in the periodic table

SymbolRu
Atomic number44
Group8
Period5
Blockd
Element categoryTransition Metal

Physical properties

Phase at STPSolid
Density12.45 g/cm3
Atomic weight101.072 u
Melting point2607 K
2333.85 °C
4232.93 °F
Boiling point4423 K
4149.85 °C
7501.73 °F

Atomära egenskaper

Electronegativity (Pauling Scale)2.2
Electron affinity100.96 kJ/mol
Ionization energies
1710.2 kJ/mol
2 1620 kJ/mol
3 2747 kJ/mol

Electron configuration

Electron configuration1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d7 5s1
Electrons per shell2, 8, 18, 15, 1

History

Discovered1844
Discovered byKarl Ernst Claus