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52Te127.603
Tellurium
MetalloidTellurium is a chemical element with symbol Te and atomic number 52. It is a brittle, mildly toxic, rare, silver-white metalloid. Tellurium is chemically related to selenium and sulfur.
Phase: Solid
2, 8, 18, 18, 6
Physical Properties
Atomic Mass127.603 u
Density6.24 g/cm³
Melting Point722.66 K
Boiling Point1261 K
Molar Heat25.73 J/(mol·K)
Period5
PhaseSolid
Chemical Properties
Electron Configuration1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p4
Semantic Config[Kr] 4d10 5s2 5p4
Shells2, 8, 18, 18, 6
Electron Affinity190.161 kJ/mol
Electronegativity2.1
Ionization Energies
IE1: 869.3 kJ/molIE2: 1790 kJ/molIE3: 2698 kJ/molIE4: 3610 kJ/molIE5: 5668 kJ/molIE6: 6820 kJ/molIE7: 13200 kJ/mol
Discovery
Discovered byFranz-Joseph Müller von Reichenstein