Canadian Medical Guide > Chemicals and Drugs > Inorganic Chemicals > Elements > Noble Gases > Helium Terms and Definitions

Helium

Medical Definition:	Helium. A noble gas with the atomic symbol He, atomic number 2, and atomic weight 4.003. It is a colorless, odorless, tasteless gas that is not combustible and does not support combustion. It was first detected in the sun and is now obtained from natural gas. Medically it is used as a diluent for other gases, being especially useful with oxygen in the treatment of certain cases of respiratory obstruction, and as a vehicle for general anesthetics. (Dorland, 27th ed)
Guide Notes:	a rare gas; He-4; He-3 = HELIUM (IM) + ISOTOPES (NIM); He-5, 6, 8 = HELIUM (IM) + RADIOISOTOPES (IM)
CAS Type 1 Name:	CAS Number:	7440-59-7

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