Skip links

Chlorine (Cl): Fun Facts and Information About the Element


What is the symbol? Cl
What is the atomic number? 17
What is the atomic weight? 35.453
What is the melting point in Celsius? -101
What is the boiling point in Celsius? -35
What is the density (g/cm3)? 3.21
What percent of the earths crust? 0.045
What year was it discovered? 1774
Who discovered the element? Carl Wilhelm Scheele
What group is the element in? 17
What is the electron configuration? [Ne] 3s2 3p5
What is the ionization energy? 12.9676
What element category is it in? Halogens

Where is Chlorine Found?

In nature it is found in the combined state only, chiefly with sodium as common salt (NaCl), carnallite, and sylvite.

What is Chlorine Used For?

It is used for producing safe drinking water the world over. Even the smallest water supplies are now usually chlorinated. It is also extensively used in the production of paper products, dyestuffs, textiles, petroleum products, medicines, antiseptics, insecticides, food, solvents, paints, plastics, and many other consumer products.

Most of the chlorine produced is used in the manufacture of chlorinated compounds for sanitation, pulp bleaching, disinfectants, and textile processing. Further use is in the manufacture of chlorates, chloroform, carbon tetrachloride, and in the extraction of bromine.