Chlorine
DIATOMIC NONMETAL
Phase: Gas
Discovered: Carl Wilhelm Scheele
Block: P
Summary
Chlorine is a chemical element with symbol Cl and atomic number 17. It also has a relative atomic mass of 35.5. Chlorine is in the halogen group (17) and is the second lightest halogen following fluorine.
Source: WikipediaPhysical Properties
Atomic Mass 35.45 u
Density 3.2 g/cm³
Melting Point 171.6 K
Boiling Point 239.11 K