Element overview
Argon (Ar) is element 18 with a listed atomic mass of 39.948 u. It is in group 18 and period 3. Its category is noble gas.
Atomic properties
Electron configuration: [Ne] 3s2 3p6. Electronegativity: not established. Common oxidation states: 0.
Physical properties
Density: 0.0017837; melting point: 83.81; boiling point: 87.3. Values depend on conditions, phase and source.