Helium
| Basic Information | Crystal Structure | Isotope | Facts | Related Links |
| Symbol: | He |
| Atomic Number: | 2 |
| Atomic weight: | 4.002602u |
| Melting Point: | 0.95K |
| Boiling Point: | 4.215K |
| Number of Protons/Electrons: | 2 |
| Number of Neutrons: | 2 |
| Classification: | Noble gas |
| Crystal Structure: | Hexagonal |
| Density | 0.00001787 g/mL |
| Color: | Colorless |
| Bonding radius: | 0.93 A |
| Atomic radius: | 0.49 A |
| Ionization Potential: | 24.587 V |
| Electronegativity: | |
| Heat of vaporization: | 0.0845 kJ/mol |
| Heat of fusion: | kJ/mol |
| Specific heat: | 5.193 J/gK |
| Electron configuration: | 1s2 |
Crystal Structure
| Isotope | Half Life |
| He3 | Stable |
| He4 | Stable |
| Date of Discovery: | 1895 |
| Discoverer: | Sir William Ramsey |
| Uses: | Bolloons, deep sea diving |
| Obtained From: | Natural gas deposit, air |