Tellurium

Symbol | Te
Latin name | Tellurium
Atomic number | 52
Period | 5
Element category | Metalloids
Relative atomic mass | 127.60
Group | VI.A
Electronegativity | 2.1
Oxidation numbers | -2, 2, 4, 6
Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p4
Density [g/cm3] | 6.25
State | Solid
Melting point [°C] | 449.5
Boiling point [°C] | 1100
Atomic radius [pm] | 123
Covalent radius [pm] | 135
Thermal conductivity [W m-1K-1] | 2.35
Heat capacity [J K-1g-1] | 0.202
Discovery | 1782
Hardness [Mohs scale] | 2.3
Brinell hardness [MPa] | 180
Young's modulus [GPa] | 43
Electrical conductivity [S m-1] | 1 · 104
Shear modulus [GPa] | 16
1.st ionization energy [eV] | 9.0096
2.nd ionization energy [eV] | 18.6
3.rd ionization energy [eV] | 27.96
Stable isotopes | 8
Unstable isotopes | 22