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Tellurium

Metalloidsolid
Symbol: Te
Atomic number: 52
Atomic mass: 127.60
Group: Non-Metal
CAS-number: 13494-80-9

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Physical data
Isotopes
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Physical data

Electronic dataThermal dataSteric data
Shells: 2, 8, 18, 18, 6
Orbitals: [Kr] 4d10 5s2 5p4
Electronegativity: 2.1, 2.0
1. Ionization potential: 9.0096 eV
2. Ionization potential: 18.60 eV
3. Ionization potential: 27.96 eV
Oxidation states: 6, 4, -2
Electrical conductivity: 2.0e-6 10^6
Melting point: 449.5 °C
Boiling point: 989.9 °C
Specific heat: 0.20 J/gK
Heat of fusion: 17.490 kJ/mol
Heat of vaporization: 52.550 kJ/mol
Thermal conductivity: 0.0235 W/cmK
Atomic radius: 1.42 Å
Ionic radius: 0.97 Å (+4)
Covalent radius: 1.36 Å
Atomic volume: 20.5 cm³/mol
Density (293 K): 6.24 g/cm³
Crystal structure: hexagonal
hexagonal

Isotopes

NuclideAbundance [%]MassSpinHalflifeDecay modeDecay tree
119Te 0 119 11/2 4.69d EC, β+ View
120Te 0.089 119.904 0 -- --
121Te 0 121 1/2 16.8d EC View
121Tem 0 121 11/2 ~154d IT, EC, β+ View
122Te 2.46 121.903 0 -- --
123Te 0.87 122.904 1/2 1.3E13y EC View
123Tem 0 123 11/2 119.7d IT View
124Te 4.61 123.903 0 -- --
125Te 6.99 124.904 1/2 -- --
125Tem 0 125 11/2 58d IT View
126Te 18.71 125.903 0 -- --
127Te 0 127 3/2 9.4h β- View
127Tem 0 127 11/2 109d IT, β- View
128Te 31.79 127.905 0 -- --
129Te 0 129 3/2 1.16h β- View
129Tem 0 129 11/2 33.6d IT, β- View
130Te 34.48 129.906 0 2.5E21y b-b- View
131Te 0 131 3/2 25.0m β- View
131Tem 0 131 11/2 1.35d β-, IT View
132Te 0 132 0 3.26d β- View
133Te 0 133 3/2 12.4m β- View
133Tem 0 133 11/2 55.4m β-, IT View
134Te 0 134 0 41.8m β- View

Other info

Name origin:Latin: tellus (earth).
Description:Silvery-white, brittle semi-metal.
Discovered by:Franz Müller von Reichenstein
Year:1782
Place:Romania
Sources:Obtained as a by-product of copper and lead refining.
Use(s):Used to improve the machining quality of copper and stainless steel products and to color glass and ceramics. Also in thermoelectric devices. Some is used in the rubber industry and it is a basic ingredient in manufacturing blasting caps.