Helium |
| Simbool | He |
|---|---|
| Latynse naam | Helium |
| Atoomgetal | 2 |
| Periode | 1 |
| Element kategorie | Edelgasse |
| Relatieve atomiese massa | 4.002602 |
| Groep | VIII.A |
| Elektronkonfigurasie | 1s2 |
| Digtheid [g/cm3] | 0.0001785 |
| Staat | Gas |
| Smeltpunt [°C] | -272.12 |
| Kookpunt [°C] | -266.934 |
| Kritiese Punt [°C] | -267.96 |
| Kritiese druk [MPa] | 0.227 |
| Atoomradius [pm] | 31 |
| Covalent radius [pm] | 32 |
| Termiese geleidingsvermoë [W m-1K-1] | 0.152 |
| Hitte kapasiteit [J K-1g-1] | 5.193 |
| Ontdekking | 1868 |
| Stabiele isotope | 2 |
| Onstabiele isotope | 2 |