noble gasses: properties, uses and discovery
| Atomic number
| Atomic mass
| Boiling point (K)
| Melting point (K)
| Helium is used as a component of breathing gases due to its low solubility in fluids or lipids. If helium is used to replace part of the breathing mixture, it causes a decrease in the narcotic effect of the gas at far depths. Helium is used to shield welding arcs and the surrounding base metal from the atmosphere during welding.
| Sir William Ramsay isolated helium on Earth by treating a variety of rare elements with acids
| Neon is used in many things, such as: neon advertising and decorative lights, fog lights, TV cine-scopes, lasers, voltage detectors, luminous warnings and also advertising signs
| These noble gases discovered by Morris W. Travers and Sir William Ramsay in 1898. Ramsay discovered Neon by chilling a sample of the atmosphere until liquid phase, then captured the gases as the boiled off by warming up the liquid.
| Argon is used in electronics to provide a protective heat transfer medium for ultra-pure semiconductors from silicon crystals and for growing germanium. Argon can also fill fluorescent and incandescent light bulbs; creating the blue light found in neon type lamps. Argon’s low thermal conductivity makes it useful in providing a gas barrier needed to produce double-pane insulated windows. This insulation barrier improves the windows' energy efficiency. Argon also creates an inert gas shield during welding; to flush out melted metals to eliminate porosity in casting; and to provide an oxygen-and-nitrogen free environment for annealing and rolling metals and alloys.
| John William Strutt and William Ramsay took a sample of air and removed the oxygen by reacting it with copper...
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