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 |