Ruthenium

Transition metals · Group 8 · Period 5

Atomic properties

Atomic number	44
Symbol	Ru
Standard atomic weight	101.07
Classification	Transition metals
Group	8
Period	5
Block	d-block
Electron configuration	[Kr] 4d7 5s1
Electronegativity (Pauling)	2.20
Common oxidation states	+4, +3

Physical properties

Phase at 20 °C	Solid
Density	12.45 g/cm³
Melting point	2334 °C
Boiling point	4150 °C
Discovered	1844
CAS number	—

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