Atomic Number: 18

Atomic Symbol: Ar

external image 558px-Electron_shell_018_Argon.svg.png
Average Atomic Mass: 39.948

Discovery: 1894 by Lord Raleigh and Sir William Ramsay.

Physical Description: Same solubility as oxygen. Colorless and odorless.

Boiling Point: -185.85 Degrees Celcius

Melting Point: -189.35 Degrees Celcius

Isotopes: Naturally occurs as a mixture of 3 isotopes. Twelve other known isotopes exist.

Uses: Used in electric lightbulbs and fluorescent tubes. Keeps the oxygen away from wine in wine barrels. Gas shield for arc welding and and cutting for production of steel and titanium. Protective atmosphere to grow silicon and germanium crystals.