Ruthenium

Transition metal · 101.1 u · group 8, period 5

Ruthenium · Ru

Atomic number44

SymbolRu

CategoryTransition metal

Standard stateSolid

Group · Period · Block8 · 5 · d

Electron configuration[Kr]5s1 4d7

Atomic mass101.1 u

Atomic radius207 pm

Protons / Neutrons / Electrons44 / 57 / 44

Shells (e⁻ per shell)2, 8, 18, 15, 1

Electronegativity (Pauling)2.2

Ionization energy7.361 eV

Electron affinity1.05 eV

Oxidation states+3

Melting point2.61e+3 K · 2.33e+3 °C

Boiling point4.42e+3 K · 4.15e+3 °C

Density12.1 g/cm³

Year discovered1827

CPK color

#248F8F

State at room temp (25 °C)

solid

Position