Periodic Table of Elements




Rhodium was discovered by English chemist and physicist William Hyde Wollaston (1766-1828) in about 1803. The origin of the name comes from the Greek word rhodon meaning rose.

Name: Rhodium
Symbol: Rh
Atomic number: 45
Atomic weight: 102.91
State: solid
Group, period, block: 9, 5, d
Color: silvery white metallic
Classification: transition metal
Electron configuration: 4s1 4d8

Physical properties

Density: 12.41 g/cm-3
Melting point: 2237 K,1964 C,3567 F
Boiling point: 3968 K,3695 C,6683 F

Atomic properties

Oxidation states: 6, 5, 4, 3, 2, 1[1], -1
Electronegativity: 2.28 (Pauling scale)
Ionization energies: 1st: 719.7 kJmol-1
Covalent radius: 1427 pm
Van der Waals radius: no data
  • Rh
  • Electron Configuration


There is one naturally occurring isotope of rhodium exists, 103Rh.