Calcium vs Krypton
| Property | Ca Calcium | Kr Krypton |
|---|---|---|
| Atomic number | 20 | 36 |
| Symbol | Ca | Kr |
| Name | Calcium | Krypton |
| Category | alkaline-earth-metal | noble-gas |
| Standard Atomic Weight | 40.078 u | 83.798 u |
| Period | 4 | 4 |
| Group | 2 | 18 |
| Block | s | p |
| Phase at STP | solid | gas |
| Electron configuration | [Ar]4s2 | [Ar]4s23d104p6 |
| Oxidation states | [1, 2] | [0, 1, 2] |
| Electronegativity (Pauling) | 1 | 3 |
| Electron affinity | 0.0245 eV | -1 eV |
| Density | 1540 kg/m³ | 3.733 kg/m³ |
| Melting point | 841.85 °C | -157.36 °C |
| Boiling point | 1483.85 °C | -153.42 °C |
| Discovery year | 1808 | 1898 |