Hydrogen vs Helium
Pumili ng hanggang 3 elemento at tingnan kung paano sila nagkakaiba.
| Katangian | Hydrogen | Helium |
|---|---|---|
| Atomic number | 1 | 2 |
| Atomic mass | 1.008 | 4.0026 |
| Electronegativity | 2.2 | — |
| Melting point | 13.99 K (-259.2 °C) | 0.95 K (-272.2 °C) |
| Boiling point | 20.27 K (-252.9 °C) | 4.22 K (-268.9 °C) |
| Density | 0.09 g/L | 0.179 g/L |
| Atomic radius | 120 pm | 140 pm |
| Ionization energy | 13.598 eV | 24.587 eV |
| Natuklasan | 1766 | 1868 |
| Kategorya | Reaktibong nonmetal | Noble gas |
| Estado sa temp. ng silid | Gas | Gas |
| Block | s | s |
| Grupo | 1 | 18 |
| Peryodo | 1 | 1 |
| Valence electron | 1 | 2 |
| Karaniwang karga | +1, −1 | 0 |
| Electron configuration | 1s1 | 1s2 |