Template:Infobox tellurium/sandbox

[[Category:Template:Pagetype with short description]]

Tellurium, ₅₂Te

Tellurium
Pronunciation	/tɪˈljʊəriəm/ ​(Template:Respell)
Appearance	silvery lustrous gray
Standard atomic weight Ar, std(Te)	Template:Val
Tellurium in the periodic table
Template:Periodic table (32 columns, micro) Se ↑ Te ↓ Po antimony ← tellurium → iodine
Atomic number (Z)	52
Group	group 16 (chalcogens)
Period	period 5
Block	p-block
Electron configuration	[Kr] 4d10 5s2 5p4
Electrons per shell	2, 8, 18, 18, 6
Physical properties
Phase at STP	solid
Melting point	722.66 K ​(449.51 °C, ​841.12 °F)
Boiling point	1261 K ​(988 °C, ​1810 °F)
Density (near r.t.)	6.24 g/cm3
when liquid (at m.p.)	5.70 g/cm3
Heat of fusion	17.49 kJ/mol
Heat of vaporization	114.1 kJ/mol
Molar heat capacity	25.73 J/(mol·K)
Vapor pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K)   (775) (888) 1042 1266
Atomic properties
Oxidation states	−2, −1, +1, +2, +3, +4, +5, +6 (a mildly acidic oxide)
Electronegativity	Pauling scale: 2.1
Ionization energies	1st: 869.3 kJ/mol 2nd: 1790 kJ/mol 3rd: 2698 kJ/mol
Atomic radius	empirical: 140 pm
Covalent radius	138±4 pm
Van der Waals radius	206 pm
Spectral lines of tellurium
Other properties
Natural occurrence	primordial
Crystal structure	​hexagonal
Speed of sound thin rod	2610 m/s (at 20 °C)
Thermal conductivity	1.97–3.38 W/(m·K)
Magnetic ordering	diamagnetic
Young's modulus	43 GPa
Shear modulus	16 GPa
Bulk modulus	65 GPa
Mohs hardness	2.25
Brinell hardness	180 MPa
CAS Number	13494-80-9
History
Naming	after Roman Tellus, deity of the Earth
Discovery	Franz-Joseph Müller von Reichenstein (1782)
First isolation	Martin Heinrich Klaproth
Main isotopes of tellurium
[[Isotope|IsoTemplate:Shytope]] [[Natural abundance|AbunTemplate:Shydance]] Half-life (t1/2) Decay mode [[Decay product|ProTemplate:Shyduct]] 120Te 0.09% >2.2×1016 y (β+β+) 120Sn 121Te syn 16.78 d ε 121Sb 122Te 2.55% - (SF) 123Te 0.89% >9.2×1016 y (ε) 123Sb 124Te 4.74% - (SF) 125Te 7.07% - (SF) 126Te 18.84% - (SF) 127Te syn 9.35 h β− 127I 128Te 31.74% 2.2×1024 y β−β− 128Xe 129Te syn 69.6 min β− 129I 130Te 34.08% 7.9×1020 y β−β− 130Xe
Decay modes in parentheses are predicted, but have not yet been observed

References

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