Francium

Atomic number: 87

Symbol: Fr

Category: Alkali metal

Density at 25°C: solid: density: uncertain perhaps 1.87 g/cm3

Francium is so unstable it has half decayed within 22 minutes , so after 44 minutes it has turned into  astatine, radium, and radon.  It is so rare that only about 20-30grams are on Earth at anyone time. 


Use, natural applications or common combinations: 

  • mostly for scientific knowledge
  • gaining more knowledge about energy levels and the coupling constants between subatomic particles.
  • Francium-223 is the result of the alpha decay of actinium-227 and can be found in trace amounts in uranium and thorium minerals


Basic characteristics:

  • Standard atomic weight: n/a
  • Melting point: n/a
  • Boiling point: n/a
  • Radioactivity: all radioactive
  • 223Fr half life 22minutes via beta and alpha decay