Atomic number: 45

Symbol: Rh

Category: transition metal

Density at 25°C: solid:  12.41 g·cm−3

Rhodium is mostly used as an alloy for catalytic converters for cars. It also known as one of the noble metals because they easily resist corrosion in moist air.

A sphere of rhodium re-melted. image: adapted from wikipedia

Use, natural applications or common combinations: 

  • Catalytic converter - as one of the catalysts in the three-way catalytic converters in automobiles.
  • Jewellery -  It is electroplated on white gold and platinum to give it a reflective white surface.

Basic characteristics:

  • Standard atomic weight: 102.905 50(2)
  • Melting point: 1964 °C
  • Boiling point: 3695 °C
  • Radioactivity: all stable