Ruthenium 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.

Atomic Weight: 101.07
Density:       12.37 g/cm3
Melting Point: 2334 °C
Boiling Point: 4150 °C