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Ar Ar symbol, atomic number 18, atomic weight 39.948, the external electronic 3s23p6 arrangement at the third cycle 0 communities. Fan atomic radius of 191 picometer, the first ionization energy 1523kJ/mol. Single-quality single-atom molecules, is a rare gas. Colorless, odorless, tasteless gas, the density of 117,837 grams / liter, -189.2 ° C melting point, boiling point -185.7 ° C, 20 ° C per liter 37.9 ml water soluble. The chemical nature extremely lively, non-combustible, and does not support combustion, not to be generated compounds. May with the water, phenol, hydroquinone formed some complex. For the filling light bulbs and fluorescent tubes, cutting or welding metal used to protect the gas. Use a small amount can be mixed with Ne made blue or green discharge. In rare gas content is a maximum, in the atmosphere or about 0.94% of the volume. In 1894 the British Rayleigh removed from the air of oxygen, nitrogen, the remaining gas was analyzed and found argon. Industrial use fractionation liquid argon air quality.
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