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Sunday, April 1, 2012

GOLONGAN 18


Helium
  • filling balloons (blimps) as it is a much safer gas than hydrogen
  • widely used as an inert gas shield for arc welding in countries where helium is cheaper than argon
  • protective gas in growing silicon and germanium crystals, and in titanium and zirconium production
  • cooling medium for nuclear reactors
  • a mixture of 80% helium and 20% oxygen is used as an artificial atmosphere for divers and others working under pressure
  • cryogenic applications
  • as a gas for supersonic wind tunnels
  • a protective gas for semiconductor materials
  • pressurizing liquid fuel rockets
 
Neon
  • used in making neon advertising signs, which accounts for its largest use
  • used to make high-voltage indicators, lightning arrestors, wave meter tubes, and TV tubes
  • neon and helium are used in making gas lasers
  • liquid neon is an economical cryogenic refrigerant. It has over 40 times more refrigerating capacity per unit volume than liquid helium and more than three times that of liquid hydrogen. It is compact, inert, and less expensive than helium when it meets refrigeration requirements
 
Argon
  • used in electric light bulbs and in fluorescent tubes at a pressure 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,
 
Krypton
  • used with argon as a low-pressure filling gas for fluorescent lights
  • used in some photographic flash lamps for high-speed photography, lamps, UV-laser spectral line used for international measurement of a metre
 
Xenon
  • used in making electron tubes, stroboscopic lamps, bactericidal lamps, and lamps used to excite ruby lasers for generating coherent light
  • used in the atomic energy field in bubble chambers, probes, and other applications where its high molecular weight is of value
  • potentially useful as a gas for ion engines
  • the perxenates are used in analytical chemistry as oxidizing agents
 
Radon
  • occasional therapeutic use
  • earthquake prediction
  • radiation therapy in hospitals
 
Ununoctium
  • Element 118 has no uses as only a very few atoms of this element have been identified.




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