• Name: Chlorine

  • Symbol: Cl

  • Number of Energy Levels: 3

  • Electrons on the outer energy level: 7

  • Atomic Number: 17

  • Atomic Mass: 35.4527 Amu

  • Protons / Electrons: 17

  • Neutrons: 18

  • Density: 3.214 g/cm3

  • Classification: Halogen

Top 16 interesting facts about Chlorine

  • Chlorine was discovered in 1774 by Carl Wilhelm Scheele.
  • Its name derives from the Greek word "khloros" which means "green".
  • Chlorine is obtained from salt and it is mainly used in water purification, public sanitation, disinfection, and antisepsis.
  • Under standard conditions chlorine is a gas having a yellow-green color.
  • Chlorine has the highest electron affinity so it is very reactive; as a result, elemental chlorine rarely can be found on Earth.
  • Chlorine is the 21st most abundant element in the Earth crust but the 2nd most abundant halogen.
  • Elemental chlorine was used in the First World War as a chemical weapon.
  • Boiling point of chlorine is at -34.6 oC (238.55 K, -30.279997 oF) and melting point at -100.98 oC (172.17 K, -149.764 oF).
  • Chlorine reacts with the majority of the elements of the Mendeleev periodic table forming compounds called chlorides (in most situations).
  • Chlorine is formed in supernovae.
  • Humans know more than two thousand chlorine compounds that occur naturally.
  • Chlorine has many isotopes but the stable isotopes are Cl-35 and Cl-37.
  • Chlorine is obtained from sodium chloride through the electrolysis process.
  • Chlorine is used in production of plastics, solvents for cleaning and degreasing, textiles, pharmaceuticals, insecticides, different cleaning products, and many more.
  • Chlorine gas is heavier than the air.
  • One of the most powerful pain killer, that is a chlorine compound, is found in the skin of the tree frog.