Potassium vs Krypton
| Property | K Potassium | Kr Krypton |
|---|---|---|
| Atomic number | 19 | 36 |
| Symbol | K | Kr |
| Name | Potassium | Krypton |
| Category | alkali-metal | noble-gas |
| Standard Atomic Weight | 39.0983 u | 83.798 u |
| Period | 4 | 4 |
| Group | 1 | 18 |
| Block | s | p |
| Phase at STP | solid | gas |
| Electron configuration | [Ar]4s1 | [Ar]4s23d104p6 |
| Oxidation states | [-1, 1] | [0, 1, 2] |
| Electronegativity (Pauling) | 0.82 | 3 |
| Electron affinity | 0.5014 eV | -1 eV |
| Density | 890 kg/m³ | 3.733 kg/m³ |
| Melting point | 63.38 °C | -157.36 °C |
| Boiling point | 758.85 °C | -153.42 °C |
| Discovery year | 1807 | 1898 |