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 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
- It is extremely inert and forms no known chemical compounds.