Tellurium

Symbol: Te
Atomic Number: 52
Atomic Weight: 127.6
Element Classification: Semimetallic
Discovered By: Franz Joseph Meller von Reichenstein
Discovery Date: 1782 (Romania)
Name Origin: Latin: tellus (earth).

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 (@20C J/g mol): 0.201
Fusion Heat (kJ/mol): 17.91
Evaporation Heat (kJ/mol): 49.8
Thermal Conductivity (@25C W/m K):
Debye Temperature (K): n/a
Pauling Negativity Number: 2.1
First Ionizing Energy (kJ/mol): 869.0
Oxidation States: 6, 4, 2
Electronic Configuration: [Kr] 4d10 5s2 5p4
Lattice Structure: Hexagonal (HEX)
Lattice Constant (): 4.450
Lattice C/A Ratio: 1.330

Mineral Hardness [no units]: 2.25
Brinell Hardness [/MN m-2]: 180

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