Atomic number: 44

Symbol: Ru

Category: transition metal

Density at 25°C: solid:  12.45 g·cm−3

This is the first in the group of platinum group of elements. Most of it is used in wear resistant electrical contacts as a thin layer.  There is lots of interest in potential uses of this in electronics.

A bar of ruthenium. image: adapted from wikipedia

Ruthenium usually occurs as a minor component of platinum ores.

Use, natural applications or common combinations: 

  • Resistant contacts
  • Solar research
  • Catalysts.

Basic characteristics:

  • Standard atomic weight: 101.07(2)
  • Melting point: 2334 °C
  • Boiling point: 4150 °C
  • Radioactivity: almost all stable