Chlorine (Cl) properties

Atomic mass, symbol and atomic number

chlorine is a naturally occurring element with the element symbol Cl and the atomic number 17. In the periodic table it stands with an atomic mass of 35.45 u in the 7th main group. The chemical element discovered by Humphry Davy in 1808 is not radioactive and is in a gaseous state at room temperature.

Profile: Chlorine

Chemical element:chlorine
Atomic number:17
Group:halogen group
explorers:Humphry Davy
Year of discovery:1808
Atomic properties
Atomic mass:35.45 u
Atomic radius:100 pm
Covalent radius:102 pm
Van der Waals radius:175 pm
Electron configuration:Ne 3s2 3p5
ionization:1251.2 kJ / mol
Physical Properties
Physical state:gaseous
Crystal structure:orthorhombisch
molar volume:17,39 · 10-6 m3/ mol
Mohs hardness:/
Melting point:-101 ° C
Boiling point:-34 ° C
Heat of fusion:3.2 kJ / mol
Heat of vaporization:20.4 k / mol
Thermal conductivity:0.008 W
Chemical properties

Did you know that ...

  • Chlorine has a yellow-greenish color?
  • Chlorine gas was used in the First World War as a chemical warfare agent?
  • much of the earth's chlorine is bound in the oceans as sodium chloride (NaCl)?
  • that the supposed smell of chlorine in swimming pools does not come from the chlorine itself, but because it makes a connection with the molecules from the urine?
  • Carl Wilhelm Scheele received chlorine by the chemical reaction of hydrochloric acid and manganese oxide in 1774?