H
Hydrogen
Element 1 · Nonmetal · Period 1, Group 1
Gas · Discovered 1766
Atomic Properties
| Atomic Number | 1 |
| Atomic Mass | 1.008u |
| Electron Configuration | 1s1 |
| Electronegativity | 2.2Pauling |
| Atomic Radius | 120pm |
| Ionization Energy | 13.598eV |
| Electron Affinity | 0.754eV |
| Oxidation States | +1, -1 |
Physical Properties
| Standard State | Gas |
| Melting Point | 13.81K |
| Boiling Point | 20.28K |
| Density | 0.00008988g/cm³ |
| Group Block | Nonmetal |
| Year Discovered | 1766 |