Helium
He4.0026 g/mol Calculated
The second most abundant element in the universe and the reason balloons rise. It is the only substance that will not freeze at ordinary pressure however cold it gets. Element 2.
Sources and notes
- The introductionfrom sourceMoleculeFinder curated
- Formula and weightcomputedPubChem
- 2D drawingcomputedPubChem structure, drawn by RDKit
Where you encounter it
A pure element or an engineered material, rather than an ingredient in a product.
Sources and notes
- The line abovefrom sourceMoleculeFinder curatedFrom the group the molecule belongs to.
Properties and sources
Calculated by PubChem
- Molecular formula
- He
- Molecular weight
- 4.0026 g/mol
Reported Hazard label (GHS), ECHA via PubChem
Warning Compressed gas pictogram (GHS04); hazard statements H280, H281
Groups it belongs to
- Category
- Element & material
- Family
- Chemical elements
- Hazard classes
- Compressed gas, GHS Warning
- Size
- Under 100 g/mol
Questions
- What is Helium?
- The second most abundant element in the universe and the reason balloons rise. It is the only substance that will not freeze at ordinary pressure however cold it gets. Element 2.
- How toxic is Helium?
- Its GHS hazard label carries the signal word Warning and the hazard pictogram Compressed gas. from source
- What kind of molecule is Helium?
- Helium has the formula He and a molecular weight of 4.003 g/mol. MoleculeFinder files it under chemical elements, in the element & material group. from sourcefrom sourcefrom sourcefrom source
Sources and notes
- Calculated valuescomputedPubChemComputed from the structure, so no laboratory conditions apply; complexity is PubChem's own structural score.
- Hazard labelfrom sourceECHA via PubChemThe label combines these classifications.
- ECHAfrom sourceAttributionSource: European Chemicals Agency, echa.europa.eu.
- Data refreshedfrom sourceMoleculeFinder2026-11-09