Name: Argon
Symbol: Ar
Atomic Number: 18
Atomic Mass: 39.948
Melting Point: 83.85 K
Boiling Point: 87.15 K

Appearance
  Color: Colorless Gas
  Crystal Structure: Cubic
  Usage: lighting
Argon is used as fluorescent lighting, electric lighting, and as an inert gas for certain weldings. They are also used as a blanket for the production of reactive elements. Bright lights just might be containing Argon.
Argon was discovered on 1894 by Sir William Ramsay. The word argon comes from the Greek work argon which means inactive. It is mainly used as lighting. It is obtained from air.

Argon has 18 protons, 18 electrons, and 22 neutrons. It's first energy level contains two electrons. The second energy level contains eight electrons. Finally, the last energy lever, the third energy level also contains eight electrons.

Facts
Argon is the most abundant noble gas.
Argon makes up about 1% of the Earth's atmosphere.
Argon was the first noble gas discovered by Ramsey and his partner.
Argon forms no compounds and therefore named after the Greek word which means "the laxy one."
Argon was the first element appeared that lead scientists to wonder about the other noble gases and their existance.
Isotope   Half Life

Ar-36      Stable
Ar-37      35.0 days
Ar-38      Stable
Ar-39      269.0 years
Ar-40      Stable
Ar-41      1.8 hourse
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