Argon Properties

Argon is the chemical element in the periodic table that has the symbol Ar and atomic number 18. The third noble gas, in group 18, argon makes up about 1% of the earth's atmosphere. Molecular Weight of argon is 39.95 lb/mol.

Argon was discovered by Rayleigh and Ramsay in 1894. The word argon originated from the Greek word argos meaning inactive.

Atomic number : 18
Atomic mass : 39.948 g.mol -1
Isotopes : 6
Electronis shell : [Ne] 3s23p6

Argon Physical Properties

• Argon is a monatomic, colorless, odorless, tasteless and nontoxic gas.
• It exists in both liquid and gas form.
  
  
• Gas Density : 1.784 kg/m3
  
  
• Boiling Point : -302.6 deg. F
  
  
• Liquid Density : 87.01 lb./ft3
  
  
• Critical Point : -188.4 deg. F
  
  
• Melting Point : -308.8 deg. F

Argon Chemical Properties

• Argon forms a clathrate with b hydroquinone, which is stable yet without true chemical bonds.
  
  
• Argon is two and a half times more soluble in water than nitrogen, with approximately the same solubility as oxygen.
  
  
• Argon's emission spectrum includes a characteristic set of red lines.
  
  
• It is extremely inert and forms no known chemical compounds.