Tellurium

telurio o teluro

Tellurium is one of the 10 rarest elements on this planet. It gets its name from the Latin word tellus, meaning earth. This element is often found as a compound with another element, such as metallic nickel, as in the case of the mineral melonite. Tellurium is also produced as a waste product when lead and copper are refined. Pure tellurium can take two forms: a shiny metallic solid or a brown powder. This element is mainly used in fiber optic glass.

Summary of properties (Te)

Atomic weight127.60(3)
Discoverer (year)Müller von Reichenstein, Franz Joseph (1782)
Natural formnon-metal solid (hexagonal)
Electron configuration[Kr] 4d10 5s2 5p4
Melting point (ºC)449
Boiling point (ºC)990
Abundance in earth's crust (ppm)0.001
Isotope (abundance)120Te (0.09), 122Te (2.55), 123Te (0.89), 124Te (4.74), 125Te (7.07), 126Te (18.84), 128Te (31.74), 130Te (34.08)
Density g/cm34.93
Van der Waals radius (pm)206
Covalent radius (pm)137
Electronegativity (Pauling)2.1
Vaporization enthalpy (kJ/mol)114.10
Enthalpy of fusion (kJ/mol)17.49
Specific heat capacity (J/g·K) at 25ºC and 1 atm0.20
Thermal conductivity (W/cm·K) at 25ºC and 1 atm0.030
Oxidation state+6, +4, -2
Electron affinity (eV)1.97
1st Ionization potential (eV)9.0096

Back to the Periodic Table of the Elements.