Chlorine - Cl

What is Chlorine?

Chlorine is the second lightest halogen and is represented as Cl. The atomic number of this chemical element is 17. It appears as a pale yellow-green gas. Liquid chlorine can cause skin burn and chlorine in its gaseous form irritates the mucous membrane. Its position as per the periodic table is between fluorine and bromine. Its electronic configuration is [Ne]3s23p5. There are two isotopes of chlorine that are stable. They are 37Cl  and 35Cl. 36Cl is the stable radioisotope of chlorine. Sodium chloride is the most common compound of chlorine whereas the simplest is hydrogen chloride. Sodium chloride has a molecular formula NaCl whereas hydrogen chloride has a molecular formula HCl. It is highly reactive. Carl Wilhelm Scheele who was a Swedish chemist discovered Chlorine in the year 1774.

Properties of Chlorine – Cl



Atomic Number‎


Atomic weight


Melting Point

−101.5 °C

Boiling Point

−34.04 °C

Chlorine structure – Cl

Chlorine structure

Cl Uses (Chlorine)

  • It is used to get rid of the smell of putrefaction
  • It is used as a disinfectant
  • Chlorine is used in the treatment of drinking water to kill bacteria
  • It is used to clean swimming pools
  • It is used in the production of paper and paper products
  • It is used as an antiseptic
  • It is used to produce drugs
  • It is used in the manufacture of dyes and plastics

Learn more about the atomic weight, electron configuration and the uses of Cl from the expert faculties at BYJU’S.

1 Comment

  1. A very good learning app ๐Ÿ‘Œ๐Ÿ‘

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