Atomic number: 11

Symbol: Na

Category: metal

Density at 25°C: solid,  0.968 g·cm−3

After neon being super stable, the element sodium is yet another very unstable element. This time forming into a solid metal, but a soft one at that, if you can get hold of it long enough. 

Sodium is so reactive that it tends to bond with anything around.  Sodium tends to react explosively when added to water. Though more practically it reacts with chlorine to make NaCl or common table salt amongst a lot of other useful compounds and chemicals.


Sodium metal is silvery and soft but reactive. image: wikipedia

Use, natural applications or common combinations: 

  • Common in minerals
  • Used in lighting technology

Basic characteristics:

  • Standard atomic weight: 22.989 769 28(2)
  • Melting point: 97.72 °C
  • Boiling point: 883 °C
  • Radioactivity: almost all stable
    • 22Na is very rare and has a half life of 2.602 years