Technetium |
| Symbol | Tc |
|---|---|
| Latin name | Tecnetium |
| Atomic number | 43 |
| Period | 5 |
| Element category | Transition elements |
| Relative atomic mass | 98.9063 |
| Group | VII.B |
| Electronegativity | 1.9 |
| Oxidation numbers | 2, 4, 7 |
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d5 5s2 |
| Density [g/cm3] | 11.56 |
| State | Solid |
| Melting point [°C] | 2150 |
| Boiling point [°C] | 4880 |
| Atomic radius [pm] | 183 |
| Covalent radius [pm] | 156 |
| Thermal conductivity [W m-1K-1] | 50.6 |
| Heat capacity [J K-1g-1] | 0.24 |
| Discovery | 1937 |
| Electrical conductivity [S m-1] | 5 · 106 |
| 1.st ionization energy [eV] | 7.28 |
| 2.nd ionization energy [eV] | 15.26 |
| 3.rd ionization energy [eV] | 29.54 |
| Stable isotopes | 0 |
| Unstable isotopes | 22 |