Chlorine

Chlorine (Cl)

Atomic Number: 17
Atomic Weight: 35.45
Melting Point: -100.98
Boiling Point: -34.6
Specific Gravity: 1.56 (liquid)
Valence(s): -1,3,5, or 7
Chlorine was discovered by Scheele in 1774 but named in 1810. It is found in nature combined usually with sodium or potassium. Pure chlorine is a yellowish-green gas that is poisonous to humans. Chlorine is used to produce materials such as textiles and paints. Chlorinated compounds are used for bleaching and disinfectants. Chlorine is used in pools. [LM] {RW}