Krypton vs Strontium
| Property | Kr Krypton | Sr Strontium |
|---|---|---|
| Atomic number | 36 | 38 |
| Symbol | Kr | Sr |
| Name | Krypton | Strontium |
| Category | noble-gas | alkaline-earth-metal |
| Standard Atomic Weight | 83.798 u | 87.62 u |
| Period | 4 | 5 |
| Group | 18 | 2 |
| Block | p | s |
| Phase at STP | gas | solid |
| Electron configuration | [Ar]4s23d104p6 | [Kr]5s2 |
| Oxidation states | [0, 1, 2] | [1, 2] |
| Electronegativity (Pauling) | 3 | 0.95 |
| Electron affinity | -1 eV | 0.052 eV |
| Density | 3.733 kg/m³ | 2640 kg/m³ |
| Melting point | -157.36 °C | 776.85 °C |
| Boiling point | -153.42 °C | 1381.85 °C |
| Discovery year | 1898 | 1792 |