Copper vs Krypton
| Property | Cu Copper | Kr Krypton |
|---|---|---|
| Atomic number | 29 | 36 |
| Symbol | Cu | Kr |
| Name | Copper | Krypton |
| Category | transition-metal | noble-gas |
| Standard Atomic Weight | 63.546 u | 83.798 u |
| Period | 4 | 4 |
| Group | 11 | 18 |
| Block | s | p |
| Phase at STP | solid | gas |
| Electron configuration | [Ar]4s13d10 | [Ar]4s23d104p6 |
| Oxidation states | [-2, 0, 1, 2, 3, 4] | [0, 1, 2] |
| Electronegativity (Pauling) | 1.9 | 3 |
| Electron affinity | 1.235 eV | -1 eV |
| Density | 8933 kg/m³ | 3.733 kg/m³ |
| Melting point | 1084.62 °C | -157.36 °C |
| Boiling point | 2561.85 °C | -153.42 °C |
| Discovery year | N/A | 1898 |