Element #17

Chlorine

halogen gas Discovered 1774

35.453 Atomic Mass (u)

-101.5 C Melting Point

-34.04 C Boiling Point

0.003214 g/cm3 Density

3.16 Electronegativity

[Ne] 3s2 3p5 Electron Config

3 Period

17 Group

📖 About Chlorine

A toxic yellow-green gas with a distinctive sharp smell. In World War I, chlorine gas was used as a chemical weapon, causing horrific casualties. Despite this dark history, chlorine is also essential for water purification and is the basis of PVC plastic. Sodium chloride (table salt) is its most famous compound.

🔧 Uses and Applications

Water disinfection and purification
PVC plastic production
Bleach and disinfectants
Pharmaceuticals
Paper and textile bleaching

💡 Did You Know?

Fact: Chlorine was the first chemical weapon deployed on a large scale in modern warfare, first used by Germany at the Second Battle of Ypres in April 1915. About 1,150 tonnes were released, killing or injuring thousands of Allied soldiers.