Tellurium - ASCII Periodic Table of the Elements

ASCII PERIODIC TABLE OF THE ELEMENTS

  Te

Relative atomic mass: 127.60 +- 0.03

English: Tellurium
French: Tellure
Croatian: Telurij
German: Tellur
Italian: Tellurio
Spanish: Teluro

Atomic number: 52
Group numbers: 16
Period: 5
Standard state (20 ^oC): solid

Discovery: 1782 Franz Joseph Muller von Reichstein (AT)

Tellurium was discovered by Franz Joseph Muller von Reichstein (AT) in 1782. The origin of the name comes from the Latin word tellus meaning earth. It is a silvery-white, brittle semi-metal that is unreactive with water or HCl, burns in air or oxygen and dissolves in HNO3. Tellurium is obtained as a by-product of copper and lead refining. It is used to improve the machining quality of copper and stainless steel products and to colour glass and ceramics. It is also used in thermoelectric devices, in the rubber industry and it is a basic ingredient in manufacturing blasting caps. The price of 99.99 % pure tellurium broken ingot is 175.90 € for 250 g.

Electronic configuration: [Kr] 4d¹⁰ 5s² 5p⁴
Formal oxidation number: -2 +4 +6
Atomic radius: 143.2 pm

Electronegativities: 2.1
Thermal conductivity: 2.35 W/(m K)
Electrical resistivity (20 ^oC): 436000 microOhm cm

Melting point: 449.51 ^oC
Boiling point: 988 ^oC

Heat of fusion: 13.5 kJ/mol
Heat of vaporization: 104.6 kJ/mol
Heat of atomization: - kJ/mol