NO. 052Metalloid
Te
Tellurium
Tellurium is a brittle metalloid used in thermoelectric devices and semiconductor materials.
Technical Specifications
Atomic Mass127.6 u
Density6.24 g/cm³
Melting Point723 K
Boiling Point1261 K
Atomic Radius123 pm
Electronegativity2.1
Ionization Energy869 kJ/mol
Electron Affinity190 kJ/mol
Bonding TypeCovalent
Oxidation States-2, 4, 6
Acid/BaseAcidic
ReactivityMedium
Electron Configuration
[Kr] 4d10 5s2 5p4
Discovered ByFranz-Joseph Müller von Reichenstein
Year1782
Known Isotopes
Te-120Te-122Te-123Te-124Te-125Te-126Te-128Te-130