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Argon

Ar
Atomic Number:
Atomic Weight:
Element Type:
Crystal Structure:
Melting Point:
Boiling Point:
Critical Temp:
Atomic Radius:
Covalent Radius:
Electronegativity:
54
131.3
Noble Gas
Cubic Face Centered
-111.75°C = -169.15°F = 161.4 K
-108.04°C = -162.472°F = 165.11 K
16.58°C = 61.844°F = 289.73 K
1.24 Å (Å = Angstrom = 10-10 m)
1.31 Å
2.6

Discovery

(Gr. argos, inactive) Its presence in air was suspected by Cavendish in 1785,discovered by Lord Rayleigh and Sir William Ramsay in 1894.

Sources

Argon gas is prepared by fractionating liquid air. The Earth's atmosphere contains 0.94% argon. Mars' atmosphere contains 1.6% Argon-40 and 5 ppm Argon-36.

Uses

Argon is used in electric lights and in fluorescent tubes, photo tubes, glow tubes, and in lasers. Argon is used as an inert gas for welding and cutting, blanketing reactive elements, and as a protective (nonreactive) atmosphere for growing crystals of silicon and germanium.


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