General | States | Energies | Oxidation & Electrons |Appearance & Characteristics
Reactions | Other Forms |Radius | Conductivity | Abundance
Encyclopedia Britannica articles


Name Tellurium Symbol Te
atomic number 52 Atomic weight 127.60
Density @ 293 K 6.24 g/cm3 Atomic volume 20.5 cm3/mol
Group Non-Metal, Chalcogen discovered 1783


state (s, l, g) s
melting point 722.7 K boiling point 1263 K
Heat of fusion 17.490 kJ/mol Heat of vaporization 52.550 kJ/mol
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1st ionization energy 869.2 kJ/mole electronegativity 2.1
2nd ionization energy 1794.6 kJ/mole electron affinity 190.16 kJ/mole
3rd ionization energy 2697.7 kJ/mole Specific heat 0.20 J/gK
heat atomization 197 kJ/mole atoms

Oxidation & Electrons

Shells 2,8,18,18,6 electron configuration [Kr] 4d10 5s2 5p4
minimum oxidation number -2 maximum oxidation number 6
min. common oxidation no. 0 max. common oxidation no. 6
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Appearance & Characteristics

structure parallel chains color silvery
uses semiconductors, steel toxicity yes
hardness 2.3 mohs characteristics semimetal


reaction with air mild, w/ht, = TeO2 reaction with 6M HCl none
reaction with 6M HCl none reaction with 15M HNO3 mild, = Te(IV)
reaction with 6M NaOH
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Other Forms

number of isotopes 8 hydride(s) H2Te
oxide(s) TeO2 TeO3 chloride(s) Te2Cl Te3Cl2 Te4Cl16


ionic radius (2- ion) 207 pm ionic radius (1- ion) pm
atomic radius 142 pm ionic radius (1+ ion) pm
ionic radius (2+ ion) pm ionic radius (3+ ion) pm
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thermal conductivity 11.54 J/m-sec-deg electrical conductivity 0 1/mohm-cm
polarizability 5.5 A^3


source Zn/Pb smelting by-product rel. abund. solar system 0.682 log
abundance earth's crust -3 log cost, pure 24 $/100g
cost, bulk $/100g
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World Wide Web presentation of Chemicool Periodic Table is © Copyright 1996-99 by David D. Hsu. Some data were provided by and used with the permission of JCE Software and is owned and copyright by the Division of Chemical Education, Inc. Additional data were provided by Perkin-Elmer through Peter Lykos of IIT. The information may not be redistributed without the permission of David Hsu or JCE Software.