ARGON
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The Basics:
Name: argon
Symbol: Ar
Atomic number: 18
Atomic weight: 39.948 (1) g r
CAS Registry ID: 7440-37-1
Group number: 18
Group name:Noble gas
Period number: 3
Block: p-block
Standard state: gas at 298 K
Color: colourless
  DESCRIPTION:
Argon is colorless and odorless. Argon is very inert and is not known to form true chemical compounds. It makes a good atmosphere for working with air-sensitive materials since it is heavier than air and less reactive than N2.

This is a diagram of an Argon atom
  ISOLATION:
Argon is present to a small extent in the atmosphere and is obtained as a byproduct from the liquefaction and separation of air. This would not normally be carried out in the laboratory and argon is available commercially in cylinders at high pressure.