1.0 2010-04-08 22:12:19 UTC 2025-11-19 01:45:46 UTC FDB016248 Helium Food processing aid (3He)helium [he] 2He Atomic helium E939 HE Helio Helium Helium (usp) Helium-3 Helium-4 Helium, compressed Helium, compressed [UN1046] [Nonflammable gas] Helium, isotope of mass 3 helium(0) O-helium P-helium He 4.0026 4.00260325 helium helium 7440-59-7 [He] InChI=1S/He SWQJXJOGLNCZEY-UHFFFAOYSA-N belongs to the class of inorganic compounds known as homogeneous noble gases. These are inorganic non-metallic compounds in which the largest atom is a halogen atom. Homogeneous noble gases Inorganic compounds Homogeneous non-metal compounds Homogeneous noble gases Homogeneous noble gas monoatomic helium melting_point Mp -272.2° (under pressure) logp 0 ChemAxon iupac helium ChemAxon average_mass 4.0026 ChemAxon mono_mass 4.00260325 ChemAxon smiles [He] ChemAxon formula He ChemAxon inchi InChI=1S/He ChemAxon inchikey SWQJXJOGLNCZEY-UHFFFAOYSA-N ChemAxon polar_surface_area 0 ChemAxon refractivity 0 ChemAxon polarizability 1.78 ChemAxon rotatable_bond_count 0 ChemAxon acceptor_count 0 ChemAxon donor_count 0 ChemAxon physiological_charge 0 ChemAxon formal_charge 0 ChemAxon Specdb::MsMs 105483 Specdb::MsMs 105484 Specdb::MsMs 105485 Specdb::MsMs 171975 Specdb::MsMs 171976 Specdb::MsMs 171977 HMDB37238 30217 #<Reference:0x000055ce2d059050> #<Reference:0x000055ce2d058e98> #<Reference:0x000055ce2d058ce0> #<Reference:0x000055ce2d058b28> odorless