Atomic number :18
Group : zero group
Boiling point:87.3 k
= Discovery :-
Argon was discovered by Lord Rayleigh and Sir William Ramsay in 1894. It was isolated by examination of the residue obtained by removing nitrogen, oxygen, carbon dioxide, and water from clean air. In fact, air contains less than 1% argon. The atmosphere of Mars contains less than 2% argon. It was recognized by the characteristic lines in the red end of the spectrum.
= Origin of name :-
from the Greek word "argos" meaning "inactive"
= Uses :-
- used in electric light bulbs and in fluorescent tubes at a
of about 3 mm,photo tubes, glow tubes, etc.
- used as an inert gas shield for arc welding and cutting
blanket for the production of titanium and other reactive elements
- protective atmosphere for growing silicon and germanium crystals ,lasers,
light bulbs electric light bulbs and fluorescent tubes, photo tubes, glow tubes,
welding, cutting, as a protective gas for other substances
the crystal structure of argon.
Space group: Fm3-m (Space group number: 225)
Structure: ccp (cubic close-packed)
a: 525.6 pm
b: 525.6 pm
c: 525.6 pm
You may view the structure of argon:
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