Atomic number: 12

Symbol: Mg

Category: metal

Density at 25°C: solid,  1.738 g·cm−3

Magnesium is known as having a whitish often slightly powdery look when it is in strips. The powder is a form of oxide that ends up protecting it. It's also very light but does tend to burn very easily with a distinctive bright white flame with lots of UV light.

image of magnesium crystals . image: adapted from wikipedia

Use, natural applications or common combinations: 

  • Common in minerals
  • Alloys in car parts to make them lighter
  • Early days photography

Basic characteristics:

  • Standard atomic weight: 24.3050(6)
  • Melting point: 650 °C
  • Boiling point: 1091 °C
  • Radioactivity: almost all naturally stable
    • 28Mg with a half-life of 20.915 hours