It's a colorless noble gas. It's orange-red when discharged. Neon is most commonly used in neon lights. The air contains a small amount of neon. Zero group element, chemical properties are not active, as a member of the noble gases.
A rare gas that is odorless, colorless, tasteless, and in small quantities. Krypton forms one millionth of the atmosphere and is obtained in the production of liquid air.
Usually a colorless, odorless gas, it is the only substance that cannot cure at standard atmospheric pressure. Helium is the least reactive element. It is mainly used as protective gas, working fluid of gas - cooled nuclear reactor and cryogenic refrigerant.
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