• Name: Francium

  • Symbol: Fr

  • Number of Energy Levels: 7

  • Electrons on the outer energy level: 1

  • Atomic Number: 87

  • Atomic Mass: 223.0 Amu

  • Protons / Electrons: 87

  • Neutrons: 136

  • Density: unknown g/cm3

  • Classification: Alkali Metal

Top 16 interesting facts about Francium

  • Francium was discovered in 1939 by Marguerite Perey. Its name derives from the name of the country France.
  • Francium's melting point is at 27.0 C (300.15 K, 80.6 F) and its boiling point is at 677.0 C (950.15 K, 1250.6 F).
  • Francium was formerly known as eka-caesium and actinium K.
  • Francium and cesium are the least electronegative elements.
  • Francium's chemical properties are similar to those of cesium.
  • Francium is highly radioactive metal.
  • Francium decays into astatine, radium, and radon.
  • Francium has the highest equivalent weight of any element.
  • Francium is believed to have a highly reflective appearance if it could be viewed in bulk (the intense heat of the decay instantly vaporize any bulk quantity).
  • Francium is the last element discovered in nature and not by synthesis.
  • Francium forms and decays in uranium and thorium ores.
  • Just 20-30g of Francium exists at any given moment on Earth's crust.
  • Francium is the most unstable element among those occurring naturally.
  • Francium does not have commercial applications other than for research purposes.
  • Francium has 34 known isotopes; none of them stable.
  • Francium is harmful to human body and has no biological role.