Electronic data		Thermal data		Steric data
Shells: 2,8,18,18,6 Orbitals: [Kr] 4d10 5s2 5p4 Electronegativity: 2.0, 2.1 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 () 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,+	View
120Te	0.089	119.904	0	--	stable	--
121Te	0	121	1/2	16.8d	EC	View
121Tem	0	121	11/2	~154d	IT,EC,+	View
122Te	2.46	121.903	0	--	stable	--
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	--	stable	--
125Te	6.99	124.904	1/2	--	stable	--
125Tem	0	125	11/2	58d	IT	View
126Te	18.71	125.903	0	--	stable	--
127Te	0	127	3/2	9.4h	-	View
127Tem	0	127	11/2	109d	IT,-	View
128Te	31.79	127.905	0	--	stable	--
129Te	0	129	3/2	1.16h	-	View
129Tem	0	129	11/2	33.6d	IT,-	View
130Te	34.48	129.906	0	2.5E21y	-b-	View
131Te	0	131	3/2	25.0m	-	View
131Tem	0	131	11/2	1.35d	-,IT	View
132Te	0	132	0	3.26d	-	View
133Te	0	133	3/2	12.4m	-	View
133Tem	0	133	11/2	55.4m	-,IT	View
134Te	0	134	0	41.8m	-	View

Legend

Name origin:	Latin: tellus (earth).
Description:	Silvery-white, brittle simi-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.