Thallium |
Symbol | Tl |
---|---|
Latin name | Thallium |
Atomic number | 81 |
Period | 6 |
Element category | Metals |
Relative atomic mass | 204.3833 |
Group | III.A |
Electronegativity | 1.8 |
Oxidation numbers | 1, 3 |
Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d10 6s2 6p1 |
Density [g/cm3] | 11.85 |
State | Solid |
Melting point [°C] | 303.5 |
Boiling point [°C] | 1457 |
Thermal conductivity [W m-1K-1] | 46.1 |
Heat capacity [J K-1g-1] | 0.129 |
Discovery | 1861 |
Hardness [Mohs scale] | 1.2 |
Young's modulus [GPa] | 8 |
Electrical conductivity [S m-1] | 5.6 · 106 |
Shear modulus [GPa] | 2.8 |
1.st ionization energy [eV] | 6.1083 |
2.nd ionization energy [eV] | 20.428 |
3.rd ionization energy [eV] | 29.829 |
Stable isotopes | 2 |
Unstable isotopes | 26 |