He
2 compounds have this formula on CompoundList.
- Molar mass
- 4.00g/mol
- Monoisotopic mass
- 4.0026Da
- Atoms
- 1
- Elements
- 1
The formula He describes a molecule made of 1 helium atom. It is written in Hill notation: with no carbon present, every element is listed in alphabetical order. The formula tells you which atoms are present, not how they are connected, which is why several different chemicals can share it.
Elemental composition
- He Helium × 1100.00%4.0026 × 1 = 4.003 g/mol
Compounds with the formula He
Isomers we list, best known first. Open one to see its structure, properties, safety data and suppliers.
Showing 1 to 2 of 2 compounds
Frequently asked questions
What is the molar mass of He?
The molar mass of He is 4.00 g/mol, calculated from standard atomic weights for 1 helium atom. The monoisotopic mass is 4.0026 Da.
How many compounds have the formula He?
CompoundList lists 2 compounds with the molecular formula He, including Helium, Helium-3. Compounds that share a formula are isomers. They contain the same atoms arranged differently, so their properties, uses and prices can be very different.