Tellurium Facts - Periodic Table of the Elements

Periodic Table of the Elements Tellurium  Basic Facts Symbol: Te Atomic Number: 52 Atomic Weight: 127.6 Electron Configuration: [Kr] 4d10 5s2 5p4 Element Classification: Semimetallic Discovery: Franz Joseph Meller von Reichenstein 1782 (Romania) Name Origin: Latin: tellus (earth). Tellurium Physical Data Density (g/cc): 6.24 Melting Point (K): 722.7 Boiling Point (K): 1263 Appearance: silvery-white, brittle semimetal Atomic Radius (pm): 160 Atomic Volume (cc/mol): 20.5 Covalent Radius (pm): 136 Ionic Radius: 56 (6e) 211 (-2e) Specific Heat (20 °C J/g mol): 0.201 Fusion Heat (kJ/mol): 17.91 Evaporation Heat (kJ/mol): 49.8 Pauling Negativity Number: 2.1 First Ionizing Energy (kJ/mol): 869.0 Oxidation States: 6, 4, 2 Lattice Structure: Hexagonal Lattice Constant (Ã…): 4.450 Lattice C/A Ratio: 1.330 References: Los Alamos National Laboratory (2001), Crescent Chemical Company (2001), Langes Handbook of Chemistry (1952), CRC Handbook of Chemistry Physics (18th Ed.) Return to the Periodic Table Chemistry Encyclopedia