Rhodium

Transition metal · 102.9055 u · group 9, period 5

Rhodium · Rh

Atomic number45

SymbolRh

CategoryTransition metal

Standard stateSolid

Group · Period · Block9 · 5 · d

Electron configuration[Kr]5s1 4d8

Atomic mass102.9055 u

Atomic radius195 pm

Protons / Neutrons / Electrons45 / 58 / 45

Shells (e⁻ per shell)2, 8, 18, 16, 1

Electronegativity (Pauling)2.28

Ionization energy7.459 eV

Electron affinity1.137 eV

Oxidation states+3

Melting point2.24e+3 K · 1.96e+3 °C

Boiling point3.97e+3 K · 3.69e+3 °C

Density12.4 g/cm³

Year discovered1803

CPK color

#0A7D8C

State at room temp (25 °C)

solid

Position