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43
Tc
[98]
Technetium
Transition metals · Group 7 · Period 5
Atomic properties
| Atomic number | 43 |
|---|---|
| Symbol | Tc |
| Standard atomic weight | [98] |
| Classification | Transition metals |
| Group | 7 |
| Period | 5 |
| Block | d-block |
| Electron configuration | [Kr] 4d5 5s2 |
| Electronegativity (Pauling) | 1.90 |
| Common oxidation states | +7, +4 |
Physical properties
| Phase at 20 °C | Solid |
|---|---|
| Density | 11.0 g/cm³ |
| Melting point | 2157 °C |
| Boiling point | 4265 °C |
| Discovered | 1937 |
| CAS number | — |