CAS Number7429-91-6
PubChem CID23912
Atomic Radius178
Atomic Volume19
Atomic Weight162.5
Boiling Point2,567
Bulk Modulus
Crystal StructureSimple Hexagonal
Covalent Radius192
Electrical Resistivity
Electron Configuration[Xe] 4f10 6s2
Electrons per shell2, 8, 18, 28, 8, 2
Heat of Fusion11.1
Heat of Vaporization280
Ionization Potential5.939
Magnetic Ordering
Magnetic Susceptibility
Mass Number66
Melting Point1,407
Atomic Number163
Oxidation States2, 3
Poisson Ratio
Shear Modulus
Specific Heat Capacity0.17
Thermal Conductivity0.107
Van der Waals radius
Young's Modulus
Abundance in Earth's crust0.00062%
Abundance in Universe2×10-7%
Dy Dysproshum 66 162.5 6 f 66 1412.0 2567.0 [Xe] 4f10 6s2 2 8 18 28 8 2 8.55 0.00062% Silver Hexagonal 1.2 {"1":"573.0","2":"1130","3":"2200","4":"3990"} 573 50 3 1.8 19.0 230.0 0.173 10.7 178.K 0 Solid, Paramagnetic, Conductor, Lanthanide, Stable, Natural dis-PRO-si-em Soft, lustrous, silvery metal. Its uses are limited to the experimental and esoteric. Usually found with erbium, holmium and other rare earths in some minerals such as monazite sand, which is often 50% rare earth by weight. hFfR_qOSa-8 Dysprosium
Tellurium was discovered in Transylvania in 1782 by Franz-Joseph Müller von Reichenstein in a mineral containing tellurium and gold.

In 1789, another Hungarian scientist, Pál Kitaibel, also discovered the element independently in an ore from Deutsch-Pilsen which had been regarded as argentiferous molybdenite.

In 1798, it was named by Martin Heinrich Klaproth who earlier isolated it from the mineral calaverite. From the Latin word tellus, earth 66 1886 Paul Emile Lecoq de Boisbaudran France From the Greek word "dysprositos" meaning "hard to obtain"

Isotopes of Tellurium

Standard Atomic Weight


Stable Isotopes

156Dy 158Dy 160Dy 161Dy 162Dy 163Dy 164Dy

Unstable Isotopes

138Dy 139Dy 140Dy 141Dy 142Dy 143Dy 144Dy 145Dy 146Dy 147Dy 148Dy 149Dy 150Dy 151Dy 152Dy 153Dy 154Dy 155Dy 157Dy 159Dy 165Dy 166Dy 167Dy 168Dy 169Dy 170Dy 171Dy 172Dy 173Dy

Tellurium and tellurium compounds are considered to be mildly toxic
In air, tellurium burns with a greenish-blue flames, forming the dioxide
The primary use of tellurium is in alloys, foremost in steel and copper to improve machinability.

Tellurium is used as a basic ingredient in blasting caps, and is added to cast iron for chill control.

It is used in vulcanizing rubber and in catalysts for petroleum cracking.

Tellurium is used as a coloring agent in ceramics.