Chemicool

Te

52

127.60
Tellurium
General | States | Energies | Oxidation & Electrons |Appearance & Characteristics
Reactions | Other Forms |Radius | Conductivity | Abundance
Encyclopedia Britannica articles

General
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

States
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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Energies
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

Reactions
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

Radius
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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Conductivity
thermal conductivity 11.54 J/m-sec-deg electrical conductivity 0 1/mohm-cm
polarizability 5.5 A^3

Abundance
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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