Tellurium is a metalloid element (atomic number 52) with mixed metallic and nonmetallic properties, important in materials science, solid-state chemistry, and semiconductor physics. It crystallizes in a trigonal structure with helical chains and exhibits anisotropic electrical and optical behavior. Tellurium and its compounds (e.g., metal tellurides) are used in thermoelectric materials, phase-change memory media, and infrared optoelectronic devices due to their tunable band gaps and high carrier mobilities. In catalysis and synthetic chemistry, tellurium compounds participate in redox processes and organotellurium intermediates, enabling selective transformations and mechanistic studies of chalcogen-mediated reactions.
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