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|
Tellurium
Chemical Properties & Compounds
| Symbol | Atomic Number | Atomic Weight | Melting Point | Boiling Point | Phase | Density | Classification |
| Te | 52 | 127.60 | 449.51 °C | 988 °C | Solid | 6.24 g/cm3 | Semi-Metal |
|
|
|
| General |
| Name, Symbol, Number |
tellurium, Te, 52 |
| Chemical series |
metalloids |
| Group, Period, Block |
16, 5, p |
| Appearance |
silvery lustrous gray
 |
| Standard atomic weight |
127.60(3) g·mol−1 |
| Electron configuration |
[Kr] 5s2 4d10 5p4 |
| Electrons per shell |
2, 8, 18, 18, 6 |
| Physical properties |
| Phase |
solid |
| Density (near r.t.) |
6.24 g·cm−3 |
| Liquid density at m.p. |
5.70 g·cm−3 |
| Melting point |
722.66 K
(449.51 °C, 841.12 °F) |
| Boiling point |
1261 K
(988 °C, 1810 °F) |
| Heat of fusion |
17.49 kJ·mol−1 |
| Heat of vaporization |
114.1 kJ·mol−1 |
| Heat capacity |
(25 °C) 25.73 J·mol−1·K−1 |
Vapor pressure
| P(Pa) |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T(K) |
|
|
(775) |
(888) |
1042 |
1266 |
|
| Atomic properties |
| Crystal structure |
hexagonal |
| Oxidation states |
±2, 4, 6
(mildly acidic oxide) |
| Electronegativity |
2.1 (scale Pauling) |
Ionization energies
(more) |
1st: 869.3 kJ·mol−1 |
| 2nd: 1790 kJ·mol−1 |
| 3rd: 2698 kJ·mol−1 |
| Atomic radius |
140 pm |
| Atomic radius (calc.) |
123 pm |
| Covalent radius |
135 pm |
| Van der Waals radius |
206 pm |
| Miscellaneous |
| Magnetic ordering |
nonmagnetic |
| Thermal conductivity |
(300 K)
(1.97–3.38) W·m−1·K−1 |
| Speed of sound (thin rod) |
(20 °C) 2610 m/s |
| Young's modulus |
43 GPa |
| Shear modulus |
16 GPa |
| Bulk modulus |
65 GPa |
| Mohs hardness |
2.25 |
| Brinell hardness |
180 MPa |
| CAS registry number |
13494-80-9 |
| Selected isotopes |
|
|
| References |
|
Tellurium Compounds
|
Source: Wikipedia article Tellurium
|
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Chemistry Quick Facts
