A colourless gaseous element belonging to group 18 (formerly group 0) of the periodic table (the noble gases); a.n. 10; r.a.m. 20.179; d. 0.9 g dm−3; m.p. –248.67°C; b.p. –246.05°C. Neon occurs in air (0.0018% by volume) and is obtained by fractional distillation of liquid air. It is used in discharge tubes and neon lamps, in which it has a characteristic red glow. It forms hardly any compounds (neon fluorides have been reported). The element was discovered in 1898 by Sir William Ramsay and Morris Travers.
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