Inert (noble gases) are chemical elements of the 8th group of the main subgroup of the periodic table of elements of D.I. Mendeleyev. Radon, xenon, krypton, argon, neon and helium belong to inert gases. Noble gases chemically slaboaktivny in this connection they were also called inert.
Too inert helium
The one-atomic gas which does not have a smell, color and taste. One of the most widespread gases in the Universe, on this indicator follows hydrogen at once. The second in ease after the same hydrogen. A gas boiling point the lowest among all known substances. Extreme conditions – the high pressure and low temperatures are necessary for creation of one of not numerous compounds of helium. Under normal conditions all chemical compounds of gas are extremely unstable.
Inhalation of gas of helium causes short-term increase in a timbre of a voice. It is connected with higher acoustic speed in the atmosphere of helium, than in usual air.
Neon
The gas which does not have a smell, color and taste. When passing through it electric current shines bright red light. This property is applied in creation of advertizing signs. As well as helium, has no stable chemical compounds. It is used as a part of coolants and as neonogeliyevy mix for breath of the divers, oceanauts and people working in the conditions of high pressure. At long inhalation of neon the nausea, dizziness, loss of consciousness and asphyxia can be observed.
Argon
The third in contents gas in the atmosphere of Earth, has no smell, color and taste. Let's dissolve in water under normal conditions. At the moment only 2 chemical compounds of argon which exist in the conditions of low temperatures are known. It is applied: - in medicine for cleaning of cuts and air as does not form connections; - as fire extinguishing substance at the fires; - in plasma cutting; - as Wednesday at arc or laser welding; - in argon medical lasers.
Krypton
The colourless gas which does not have taste and a smell is three times heavier than air. It is chemically inert, but in certain conditions reacts with gas fluorine. It is applied to filling of space between glasses in double-glazed windows as has small heat conductivity and high sound-proof qualities. Also it is used by production of excimer lasers.
With a pressure more than 6 atmospheres gas gets the caustic and pungent smell similar to a chloroform smell.
Xenon
Gas without color, taste and a smell in the digit atmosphere shines in bright violet color. The first noble gas for which chemical compounds without use of extreme conditions were received. Reacts with fluorine, hydrogen and oxygen. It is applied: - as filler of glow lamps; - as radiation source in medical radiography; - in ionic and plasma engines of spacecrafts; - as inhalation anesthesia; - for fluorine transportation.
Radioactive gas radon
The radioactive gas which does not have a smell, taste and color. It is well dissolved in water, even better dissolved in fatty tissue of the person and in organic solvents. Radioactivity of gas promotes its fluorescence. Shines in blue color, when passing through a digit tube color changes on dark blue. The most active of inert gases. It is applied in medicine as a component of radonic bathtubs. Also radon is used in geology for the forecast of earthquakes. At frequent inhalation of radon the lung cancer can develop.