Dy Disprosio 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"

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.