Cl - Chlorine

Chlorine

 Chlorine 
Cl
Atomic Number: 17
Atomic Weight: 35.4527
Element Type: Halogen
Crystal Structure: Orthorhombic
Melting Point: -101.5°C = -150.7°F = 171.65 K
Boiling Point: -34.04°C = -29.272°F = 239.11 K
Critical Temp: 143.8°C = 290.84°F = 416.95 K
Atomic Radius: 0.97 Å (Å = Angstrom = 10-10 m)
Covalent Radius: 0.99 Å
Electronegativity: 3.16

History

(Gr. chloros, greenish yellow) Discovered in 1774 by Scheele, who thought it containedoxygen. Chlorine was named in 1810 by Davy, who insisted it was an element.


Sources

In nature it is found in the combined state only, chiefly with sodium as common salt(NaCl), carnallite, and sylvite.