helium
PubChem Notes:
Helium 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)
MediLexicon He - Medical Dictionary Definition for Term 'He'
[1. Symbol for helium, a preceding superscript number indicates an isotope.
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