| Attribute | Value |
|---|---|
| Symbol | H |
| Standard state | Gas |
| Atomic mass | 1.008 u |
| Electron configuration | 1s¹ |
| Oxidation states |
|
| Electronegativity (pauling scale) | 2.2 |
| Atomic radius (van der waals) | 120 pm |
| Ionization energy | 13.598 eV |
| Electron affinity | 0.754 eV |
| Melting point | 13.81 K |
| Boiling point | 20.28 K |
| Density | 8.988E-5 g/cm³ |
| Atomic number | 1 |
| Group name | Nonmetal |
| Discovered | 1766 year |