| Hydrogen | |
| Elemental State | H2 |
| Electron Configuration | 1s1 |
| First Ionization Potential | 13.598 eV |
| Electron Affinity | 0.754 eV |
| Z* | +1 |
| Pauling Electronegativity | 2.20 |
| Covalent Radius | 0.37 Å |
| Metallic Radius | |
| Ionic Radius | –0.24 Å H+ coordination number
= 1
–0.04 Å H+ coordination number = 2 1.22 Å H– coordination number = 4 1.40 Å H– coordination number = 6 |
| van der Waal's radius | 1.20 Å |
| Melting Point | –259.24 oC |
| Boiling Point | –252.87 oC |
| Density | 0.08988 g/L |
| Other Properties | |