Argon vs Krypton
Pick up to 3 elements and see how they stack up.
| Property | Argon | Krypton |
|---|---|---|
| Atomic number | 18 | 36 |
| Atomic mass | 39.948 | 83.798 |
| Electronegativity | — | 3 |
| Melting point | 83.81 K (-189.3 °C) | 115.78 K (-157.4 °C) |
| Boiling point | 87.3 K (-185.8 °C) | 119.93 K (-153.2 °C) |
| Density | 1.784 g/L | 3.733 g/L |
| Atomic radius | 188 pm | 202 pm |
| Ionization energy | 15.76 eV | 14 eV |
| Discovered | 1894 | 1898 |
| Category | Noble gas | Noble gas |
| State at room temp. | Gas | Gas |
| Block | p | p |
| Group | 18 | 18 |
| Period | 3 | 4 |
| Valence electrons | 8 | 8 |
| Common charges | 0 | 0 |
| Electron configuration | [Ne] 3s2 3p6 | [Ar] 3d10 4s2 4p6 |