Hydrogen vs Oxygen
Pick up to 3 elements and see how they stack up.
| Property | Hydrogen | Oxygen |
|---|---|---|
| Atomic number | 1 | 8 |
| Atomic mass | 1.008 | 15.999 |
| Electronegativity | 2.2 | 3.44 |
| Melting point | 13.99 K (-259.2 °C) | 54.36 K (-218.8 °C) |
| Boiling point | 20.27 K (-252.9 °C) | 90.19 K (-183 °C) |
| Density | 0.09 g/L | 1.429 g/L |
| Atomic radius | 120 pm | 152 pm |
| Ionization energy | 13.598 eV | 13.618 eV |
| Discovered | 1766 | 1774 |
| Category | Reactive nonmetal | Reactive nonmetal |
| State at room temp. | Gas | Gas |
| Block | s | p |
| Group | 1 | 16 |
| Period | 1 | 2 |
| Valence electrons | 1 | 6 |
| Common charges | +1, −1 | −2 |
| Electron configuration | 1s1 | [He] 2s2 2p4 |