Krypton vs Niobium
| Property | Kr Krypton | Nb Niobium |
|---|---|---|
| Atomic number | 36 | 41 |
| Symbol | Kr | Nb |
| Name | Krypton | Niobium |
| Category | noble-gas | transition-metal |
| Standard Atomic Weight | 83.798 u | 92.90637 u |
| Period | 4 | 5 |
| Group | 18 | 5 |
| Block | p | s |
| Phase at STP | gas | solid |
| Electron configuration | [Ar]4s23d104p6 | [Kr]5s14d4 |
| Oxidation states | [0, 1, 2] | [-3, -1, 0, 1, 2, 3, 4, 5] |
| Electronegativity (Pauling) | 3 | 1.6 |
| Electron affinity | -1 eV | 0.893 eV |
| Density | 3.733 kg/m³ | 8570 kg/m³ |
| Melting point | -157.36 °C | 2476.85 °C |
| Boiling point | -153.42 °C | 4743.85 °C |
| Discovery year | 1898 | 1801 |