Krypton vs Technetium
| Property | Kr Krypton | Tc Technetium |
|---|---|---|
| Atomic number | 36 | 43 |
| Symbol | Kr | Tc |
| Name | Krypton | Technetium |
| Category | noble-gas | transition-metal |
| Standard Atomic Weight | 83.798 u | 98 u |
| Period | 4 | 5 |
| Group | 18 | 7 |
| Block | p | s |
| Phase at STP | gas | solid |
| Electron configuration | [Ar]4s23d104p6 | [Kr]5s24d5 |
| Oxidation states | [0, 1, 2] | [-3, -1, 1, 2, 3, 4, 5, 6, 7] |
| Electronegativity (Pauling) | 3 | 1.9 |
| Electron affinity | -1 eV | 0.55 eV |
| Density | 3.733 kg/m³ | 1.100000e+4 kg/m³ |
| Melting point | -157.36 °C | 2156.85 °C |
| Boiling point | -153.42 °C | 4264.85 °C |
| Discovery year | 1898 | 1937 |