Name Tellurium
Symbol Te
Atomic Number 52
Atomic Mass 127.6 atomic mass units
Number of Protons 52
Number of Neutrons 76
Number of Electrons 52
Melting Point 449.5 C
Boiling Point 989.8 C
Density 6.24 grams per cubic centimeter
Normal Phase Solid
Family Metalloids
Period 5
Cost $14 per pound



Origin of Name From the Latin word tellus, meaning earth
Date and Place of Discovery In 1782 in Transylvania
Discovered by Franz Joseph Mδller von Reichenstein
Common Compounds
Interesting facts
  • It is a relatively rare element as the rarest stable solid element in the earth's crust.
  • It is mildly toxic.
  • When exposed to as little as .01 milligrams per cubic meter of tellurium, humans develop tellurium breath, which has a garlic order.
  • It improves the machine-ability of copper and stainless steel.
Common Uses
  • Thermoelectric devices
  • Blasting caps
  • Ceramics and glass coloring


Photo Courtesy of
Chemical Elements
Los Alamos National Labs
Web Elements

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