Helium vs Krypton
| Property | He Helium | Kr Krypton |
|---|---|---|
| Atomic number | 2 | 36 |
| Symbol | He | Kr |
| Name | Helium | Krypton |
| Category | noble-gas | noble-gas |
| Standard Atomic Weight | 4.002602 u | 83.798 u |
| Period | 1 | 4 |
| Group | 18 | 18 |
| Block | s | p |
| Phase at STP | gas | gas |
| Electron configuration | 1s2 | [Ar]4s23d104p6 |
| Oxidation states | [0] | [0, 1, 2] |
| Electronegativity (Pauling) | N/A | 3 |
| Electron affinity | -0.5 eV | -1 eV |
| Density | 0.1785 kg/m³ | 3.733 kg/m³ |
| Melting point | -272.2 °C | -157.36 °C |
| Boiling point | -268.93 °C | -153.42 °C |
| Discovery year | 1868 | 1898 |