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For example, the atomic weight of the element chlorine is 35.453, determined by averaging the atomic masses and relative abundances of its two main naturally occurring isotopes, which have atomic masses of about 35 and 37.
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.