Helium > Properties
From Citizendium, the Citizens' Compendium
< Helium
| Atomic symbol: | He | |
| Atomic number: | 2 | |
| Atomic mass: | 4.002602 | |
| Standard phase: | Gas | |
| Elemental Class: | Noble Gas | |
| Electronegativity: | n/a | |
| Density: | 0.1785g/L | |
| Molar volume: | 31.8 cm3/mol | |
| Melting point: | -272.05°C*† | |
| Boiling point: | -268.93°C | |
| Heat of fusion: | 5.23kJ/mol | |
| Heat of vaporization: | 0.083 kJ/mol | |
| Crystal structure: | Hexagonal | |
| Atomic radius: | 0.49Å | |
| Covalent radius: | 0.93Å | |
| Thermal conductivity: | 0.00152 W/cmK | |
| Please see template {{Props}} for instructions on adding new properties of Helium to this table. | ||
