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