Helium vs Neon
Pick up to 3 elements and see how they stack up.
| Property | Helium | Neon |
|---|---|---|
| Atomic number | 2 | 10 |
| Atomic mass | 4.0026 | 20.18 |
| Electronegativity | — | — |
| Melting point | 0.95 K (-272.2 °C) | 24.56 K (-248.6 °C) |
| Boiling point | 4.22 K (-268.9 °C) | 27.07 K (-246.1 °C) |
| Density | 0.179 g/L | 0.9 g/L |
| Atomic radius | 140 pm | 154 pm |
| Ionization energy | 24.587 eV | 21.565 eV |
| Discovered | 1868 | 1898 |
| Category | Noble gas | Noble gas |
| State at room temp. | Gas | Gas |
| Block | s | p |
| Group | 18 | 18 |
| Period | 1 | 2 |
| Valence electrons | 2 | 8 |
| Common charges | 0 | 0 |
| Electron configuration | 1s2 | [He] 2s2 2p6 |