#17 Chlorine

Chlorine is in group 17 of periodic table, also called the halogens, and is not found as the element in nature - only as a compound. The most common of these being salt, or sodium chloride, and the potassium compounds sylvite (or potassium chloride) and carnallite (potassium magnesium chloride hexahydrate).

Atomic mass:35.4527 amu

Melting point:-100.98 C (172.17 K, -149.764 F)

Boiling point:-34.6 C (238.55 K, -30.279997 F)

Density:293 K: 3.214 g/cm3