tellurium
Silver-white, semi-metallic (metalloid) element, atomic number 52, relative atomic mass 127.60. Chemically it is similar to sulphur and selenium, and it is considered one of the sulphur group. It occurs naturally in telluride minerals, and is used in colouring glass blue-brown, in the electrolytic refining of zinc, in electronics, and as a catalyst in refining petroleum.
It was discovered in 1782 by the Austrian mineralogist Franz Müller (1740–1825), and named in 1798 by the German chemist Martin Klaproth.
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