Gallery
Unknown authorUnknown author, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/tellurium.php
Physical Propertiesmass · density · phase · crystal
Atomic Mass
127.6000Da
Density
6.2320g/cm³
Phase (STP)
Solid
Melting Point
722.7K
Boiling Point
1261.2K
Molar Heat
0.2020J/(mol·K)
Crystal Structure
HEX
Lattice Constant
4.450Å
Atomic Radiiatomic · covalent · van der Waals
Atomic (Empirical)
140.00pm
Covalent
136.00pm
Van der Waals
206.00pm
Electronic Propertieselectronegativity · ionization · affinity
Electron Configuration
[Kr] 4d10 5s2 5p4
Electron Shells
2, 8, 18, 18, 6
Electronegativity
2.10Pauling
Electron Affinity
2.0kJ/mol
1st Ionization Energy
9.0kJ/mol
Oxidation States
-2, +2, +4, +5, +6
Orbital DiagramAufbau · Hund's rule · Pauli exclusion
Full: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p4Short: [Kr] 4d10 5s2 5p4
Ionization Energies (52 known)
Emission Spectrumvisible range · characteristic spectral lines
Abundanceby mass
Log scale · ppm = parts per million by mass
Biological Role
No known biological role. Mildly toxic; causes garlic breath odor.
Discovery
Discovered By
Franz Müller von Reichenstein
Named By
—
Year
1782
Nuclear Data
Known Isotopes
42
Stable Isotopes
6
Stable Mass Numbers
120, 122, 123, 124, 125, 126
Natural isotopic abundance (IUPAC recommended values)
Isotopes of Te42 known
| Nuclide | Z | N | Mass (AMU) | Half-life | Decay | Jπ | Abundance |
|---|---|---|---|---|---|---|---|
| 104Te | 52 | 52 | 103.946723 | Unknown | α (1%) | 0+ | — |
| 105Te | 52 | 53 | 104.943305 | 633 ns | α (1%) | 7/2+ | — |
| 106Te | 52 | 54 | 105.937499 | 78.0 μs | α (1%) | 0+ | — |
| 120Testable | 52 | 68 | 119.904066 | Stable | 2β⁺ | 0+ | 9.0000% |
| 122Testable | 52 | 70 | 121.903045 | Stable | stable (1%) | 0+ | 255.0000% |
| 123Testable | 52 | 71 | 122.904271 | Stable | EC (1%) | 1/2+ | 89.0000% |
| 124Testable | 52 | 72 | 123.902818 | Stable | stable (1%) | 0+ | 474.0000% |
| 125Testable | 52 | 73 | 124.904431 | Stable | stable (1%) | 1/2+ | 707.0000% |
| 126Testable | 52 | 74 | 125.903312 | Stable | stable (1%) | 0+ | 1884.0000% |
| 128Te | 52 | 76 | 127.904461 | 2250000000000000 Gy | 2β⁻ (1%) | 0+ | 3174.0000% |
| 130Te | 52 | 78 | 129.906223 | 791000000000 Gy | 2β⁻ (1%) | 0+ | 3408.0000% |
| 143Te | 52 | 91 | 142.956489 | 120 ms | β⁻ (1%), β⁻n, 2n | 7/2+ | — |
| 144Te | 52 | 92 | 143.961116 | 93.0 ms | β⁻ (1%), β⁻n, 2n | 0+ | — |
| 145Te | 52 | 93 | 144.967783 | Unknown | β⁻, β⁻n, 2n | 0+ | — |