Science / Periodic Table of Elements / Neon (Ne): Atomic number: 10, Atomic mass: 20.179 g.mol -1, Electronegativity: unknown, Density: 0.9*10 -3 g.cm-3 at 20°C, Melting point: -249 °C, Boiling point: -246 °C, Vanderwaals radius: 0.16 nm, Ionic radius: unknown, Isotopes: 3, Electronic shell: [ He ] 2s22p6, Energy of first ionisation: 2080 kJ.mol -1, Energy o second ionisation: 3952 kJ.mol -1, Standard potential: 6122 kJ.mol -1, Discovered by: Sir Ramsay in 1898. Neon is the second-lightest noble gas, its colour is reddish-orange in a vacuum discharge tube and in neon lamps. The the refrigerating capacity of helium is over 40 times the one of liquid helium and three times that of liquid hydrogen (on a per unit volume basis). It is a less expensive refrigerant than helium in most applications. Even though neon is for most practical purposes an inert element, it can form an exotic compound with fluorine in the laboratory. It is not known for certain if this or any neon compound exists naturally but some evidence suggests that this may be true. The ions, Ne+, (NeAr)+, (NeH)+, and (HeNe+) are have also been observed from optical and mass spectrometric research. In addition, neon forms an unstable hydrate. Applications: The reddish-orange color emitted in neon lights is widely used to make advertising signs. Neon is also used generically for these types of lights when in reality many other gases are used to produce different colors of light. Other uses of neon include high-voltage indicators, lightning arrestors, wave meter tubes and television tubes. Neon and helium are used to make a type of gas laser. Liquefied neon is commercially used as an economical cryogenic refrigerant. Neon in the environment: Although neon is the forth most abundant element in the universe, only 0.0018% in volume of the earth's atmosphere is neon. Neon is usually found in the form of a gas with molecules consisting of a single Neon atom. Neon is a rare gas that is found in the Earth's atmosphere at 1 part in 65,000.
Health / Disease / Trismus Nascentium Or Neonatorum: A form of tetanus seen only in infants, almost invariably in the first five days of life. MORE
Business / Agriculture / Northern Europe (NE) Cotton Price: An average of the five lowest prices of several internationally-traded cottons (including cost, insurance, and freight) quoted for delivery in Northern Europe. The NE price is used by USDA in its form MORE