Atomic number: 78

Symbol: Pt

Category: transition metal (noble metal)

Density at 25°C: solid: density: 21.45 g·cm−3

This well known metal element is the least reactive of all elements. This non-reactivity makes it especially useful for applications such as electrolysis, electrical contacts. Due to it's rarity it is an important commodity in economic exchanges. It can be found in it's pure form naturally too.

Platinum crystal. image: adapted from wikipedia

Use, natural applications or common combinations: 

  • electrical contacts
  • catalytic converts to allow the complete burning of unreacted hydrocarbons
  • jewellery
  • part of prototype 1889 of the metre

Basic characteristics:

  • Standard atomic weight: 195.084(9)
  • Melting point: 1768.3 °C
  • Boiling point: 3825 °C
  • Radioactivity: almost all naturally stable