Tellurium

Metalloid

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

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Electronic 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

Thermal data

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

Steric data

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

Nuclide	Abundance [%]	Mass	Spin	Halflife	Decay mode	Decay 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

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.

Tellurium

Physical data

Electronic data

Thermal data

Steric data

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