Facts About Tellurium

Electron configuration and elemental properties of tellurium.
Credit: Greg Robson/Creative Commons, Andrei Marincas | Shutterstock
Atomic Number: 52
Atomic Symbol: Te
Atomic Weight: 127.60
Melting Point: 841.1 F (449.5 C)
Boiling Point: 1,810.4 F (988 C)

Word origin: Tellurium comes from the Latin word tellus, which means earth.

Discovery: The element was discovered by Muller von Reichenstein in 1782. It was named by German chemist Martin Heinrich Klaproth in 1798.

A disk of metallic tellurium, 3.5 cm in diameter.
Credit: Images of elements

Properties of tellurium

Tellurium is a silvery-white metalloid; its pure version has a metallic luster. Crystalline tellurium is easily pulverized. In its molten state, tellurium is corrosive to copper, iron and stainless steel. [See Periodic Table of the Elements]

There are thirty known isotopes of tellurium. Natural tellurium has eight isotopes. The element and its compounds are likely toxic to handle.

Sources of tellurium

Tellurium is usually found as calaverite, the telluride of gold, and also combined with other metals. It is found commercially in electrolytic refining of blister copper from anode muds during the process. It is occasionally found in its native state. Amorphous tellurium is made by precipitating it from a solution of telluric acid.

Uses of tellurium

The element is a semiconductor that shows a greater electrical conductivity in certain directions or when exposed to light.

Tellurium is often used to improve the machinability of copper and stainless steel. It’s used to make blasting caps, added to cast iron and used in ceramics. Adding tellurium to lead improves the strength and hardness of the metal and decreases corrosion. Many thermoelectric devices are made with bismuth telluride. Lead telluride is used in far-infrared detectors.

(Source: Los Alamos National Laboratory)

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