• Name: Astatine

  • Symbol: At

  • Number of Energy Levels: 6

  • Electrons on the outer energy level: 7

  • Atomic Number: 85

  • Atomic Mass: 210.0 Amu

  • Protons / Electrons: 85

  • Neutrons: 125

  • Density: unknown g/cm3

  • Classification: Halogen

Top 12 interesting facts about Astatine

  • Astatine was discovered in 1940 by D.R. Corson. Its name derives from the Greek word "astatos" which means "unstable".
  • Astatine's melting point is at 302.0 C (575.15 K, 575.6 F) and its boiling point is at 337.0 C (610.15 K, 638.6 F).
  • Astatine occurs on Earth as a result of the radioactive decay of other heavier elements.
  • Astatine is a very radioactive element.
  • Only less than 1 gram of astatine is found on Earth's crust at any given time and only six of its isotopes are produced naturally.
  • Astatine is the second rarest element on Earth's crust after berkelium.
  • Astatine does not have stable isotopes. All its 32 isotopes are unstable.
  • Very little is known about astatine comparing with other elements.
  • Astatine's properties are similar to those of iodine making astatine to be considered the heavier brother of iodine.
  • Astatine has never been viewed by any human since it is vaporized by the heat generated by its own radioactivity.
  • Chemically, astatine is believed to behave as other halogens.
  • Astatine-211 is used in medicine to treat some diseases via its emission of alpha particles.