52
Te
127.60
Tellurium
General | States | Energies | Oxidation & Electrons |
Appearance & Characteristics | Reactions |
Other Forms Radius | Conductivity | Abundance



General:

Name: Tellurium Symbol: Te
Group: Non-Metal, Chalcogen 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): solid
Melting point: 722.7 K Boiling point: 1263 K
Heat of fusion: 17.490 kJ/mol Heat of vaporization: 52.550 kJ/mol

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

Appearance & Characteristics

Structure: parallel chains Color: silvery
Uses: semiconductors, steel Toxicity: yes
Hardness: 2.3 mohs Characteristics: metalloid

Reactions

Reaction with air: mild, w/ht, => TeO2
Reaction with 6 M HCl: none Reaction with 6 M HCl: none
Reaction with 15 M HNO3: mild, => Te(IV) Reaction with 6 M NaOH:

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

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