• Name: Iodine

  • Symbol: I

  • Number of Energy Levels: 5

  • Electrons on the outer energy level: 7

  • Atomic Number: 53

  • Atomic Mass: 126.904 Amu

  • Protons / Electrons: 53

  • Neutrons: 74

  • Density: 4.93 g/cm3

  • Classification: Halogen

Top 17 interesting facts about Iodine

  • Iodine was discovered in 1811 by Bernard Courtois. Iodine's name derives from the Greek word "iodes" which means "violet".
  • Iodine's melting point is at 113.5 C (386.65 K, 236.3 F) and its boiling point is at 184.0 C (457.15 K, 363.2 F).
  • Iodine, under standard conditions, is bluish-black.
  • Iodine elemental vapor is violet-purple/pink.
  • Iodine has only one stable isotope, 127-I.
  • Free iodine occurs naturally as a diatomic molecule I2.
  • Iodine is preponderantly found on Earth in oceans as iodine ion I-.
  • Iodine is also found in rocks but in slighter lower concentration.
  • Iodine is very important for life and has an important biological role.
  • Iodine deficiency is the main cause of intellectual disabilities.
  • Iodine's annually production is about 19,000 tones.
  • Iodine forms compounds with all elements but not with noble gases.
  • Chile is the largest producer of iodine (obtained from caliche, a sedimentary rock).
  • Japan and the USA are the largest producers of iodine from brine (brine is a solution of salt in water).
  • Iodine and its compounds main use is in nutrition, and the production of acetic acid and different polymers.
  • Elemental iodine is used as a disinfectant.
  • Iodine has various uses in medicine.