which family is chlorine a member of
Chlorine Basic Facts. Properties: Chlorine has a melting point of -100.98Â°C, boiling point of -34.6Â°C, density of 3.214 g/l, specific gravity of 1.56 (-33.6Â°C), with a valence of 1, 3, 5, or 7. Chlorine is a member of the halogen group of elements and directly combines with almost all of the other elements. Chlorine gas is a greenish yellow. Chlorine figures prominently in many organic chemistry reactions, particularly in substitutions with hydrogen.