Neon (redirected from NEONS)

neon (nē`ŏn) [Gr.,=new], gaseous chemical element; symbol Ne; at. no. 10; at. wt. 20.179; m.p. −248.67°C;; b.p. −246.048°C;; density 0.8999 grams per liter at STP; valence 0. Neon is a colorless, odorless, and tasteless gas. It is one of the inert gases in Group 18 of the periodic table; it does not form compounds in the normal chemical sense. A small amount of neon in a partially evacuated glass tube emits a bright reddish-orange glow while conducting electricity. Neon is a rare gas present in the atmosphere to a very limited extent. It is obtained as a byproduct in the production of liquid air. The greatest commercial use of neon is in advertising signs (see lighting). It is also used in high-intensity beacons, in some electron tubes, in Geiger counters, in automotive ignition timing lights, and in high-voltage warning indicators. It is used for particle detection in high-energy physics research. Neon finds use in lasers both as a light-emitting agent and as a coolant. Liquid neon is a particularly good cryogenic refrigerant since it will absorb more heat without vaporizing than an equal volume of liquid helium or liquid hydrogen. Neon was discovered in 1898 by William Ramsay and M. W. Travers.

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neon

Chemical element, chemical symbol Ne, atomic number 10. One of the noble gases, neon is colourless, odourless, tasteless, and completely unreactive. It occurs in minute amounts in the atmosphere and is obtained by fractional distillation of liquefied air. When under low pressure, it glows a bright orange-red if an electric current is passed through it. It was discovered in 1898, and since the 1920s its chief use has been in luminous tubes and bulbs.

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neon

a colourless odourless rare gaseous element, an inert gas occurring in trace amounts in the atmosphere: used in illuminated signs and lights. Symbol: Ne; atomic no.: 10; atomic wt.: 20.1797; valency: 0; density: 0.899 90 kg/m³; melting pt.: --248.59?C; boiling pt.: --246.08?C

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neon [′nē‚än]

(chemistry)

A gaseous element, symbol Ne, atomic number 10, atomic weight 20.179; a member of the family of noble gases in the zero group of the periodic table.

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neon

An inert gas which produces a reddish orange glow when used in an electric discharge lamp.

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Neon - Charles Duff. An object-oriented extension of FORTH, for the Mac. Inheritance, SANE floating-point, system classes and objects for Mac interfacing, overlays. Sold by Kriya Systems, 1985-1988. Modified, made PD and renamed Yerk.

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Neon 

(Latin, neonum), Ne, a chemical element of Group VIII in the Mendeleev periodic system. An inert gas: atomic number, 10; atomic weight, 20.179. On earth it is found mainly in the atmosphere, which is estimated to contain 7.1 × 10¹¹ tons of neon. The neon content of air is about 16 cm³/m³. Atmospheric neon is a mixture of three stable isotopes—²⁰Ne, ²¹Ne, and ²²Ne; the first isotope predominates (90.92 percent). Neon was discovered in 1898 by the British scientists W. Ramsay and M. Travers during their study of the highly volatile fraction of liquid air. The name “neon” is derived from the Greek neos, “new.”

Under ordinary conditions, neon is a colorless, odorless gas. At 0°C and 760 mm of mercury (101 kilonewtons per sq m), the density of neon is 0.900 g/l; melting point, —248.6°C; boiling point, -245.9°C (at 101 KN/m²); solubility in water, 10.4 ml/l. Solid neon has a cubic crystal lattice; the lattice constant a of the unit cell is 4.52 angstroms at —253°C. The neon molecule is monatomic; the outer electron shell of the neon atom contains eight electrons and is highly stable. Neon compounds have not yet been synthesized.

Neon is produced by the fractionation of air. Its largest single use is in electrical engineering. Neon-filled lamps emitting red light are used at harbors, airports, and other locations. Liquid neon is coming to be used in the production of low temperatures.