- 🇬🇧 Tellurium
- 🇺🇦 Телур
- 🇨🇳 碲
- 🇳🇱 Telluur
- 🇫🇷 Tellure
- 🇩🇪 Tellur
- 🇮🇱 טלוריום
- 🇮🇹 Tellurio
- 🇯🇵 テルル
- 🇵🇹 Telúrio
- 🇪🇸 Teluro
- 🇸🇪 Tellur
- 🇷🇺 Теллур
- Name: tellurium
- Symbol: Te
- Atomic number: 52
- Relative atomic mass (Ar): 127.60 (3) g [see note g]
- Standard state: solid at 298 K
- Appearance: silvery lustrous grey
- Classification: Semi-metallic
- Group in periodic table: 16
- Group name: Chalcogen
- Period in periodic table: 5
- Block in periodic table: p
- Shell structure: 2.8.18.18.6
- CAS Registry: 13494-80-9
Tellurium atoms have 52 electrons and the shell structure is 2.8.18.18.6. The ground state electronic configuration of neutral tellurium is [Kr].4d10.5s2.5p4 and the term symbol of tellurium is 3P2.
Tellurium: description
Crystalline tellurium has a silvery-white appearance, and exhibits a metallic lustre when pure (see above). It is brittle and easily pulverised. Tellurium is a p-type semiconductor, and shows varying conductivity with crystal alignment. Its conductivity increases slightly with exposure to light. It can be doped with silver, copper, gold, tin, or other elements.
Humans exposed to as little as 0.01 mg m-3 in air, or less, develop "tellurium breath", which has a garlic-like odour.
Tellurium: physical properties
- Density of the chemical elements on a miniature periodic table spark table Density of solid: 6240 kg m-3
- Molar volume of the chemical elements on a miniature periodic table spark table Molar volume: 20.46 cm3
- Thermal conductivity of the chemical elements on a miniature periodic table spark table Thermal conductivity: 3 W m‑1 K‑1
Tellurium: heat properties
- Melting point on a miniature periodic table spark table Melting point: 722.66 [449.51 °C (841.12 °F)] K
- Boiling point on a miniature periodic table spark table Boiling point: 1261 [988 °C (1810 °F)] K
- Enthalpy of fusion on a miniature periodic table spark table Enthalpy of fusion: 20.5 kJ mol-1
Tellurium: atom sizes
- Atomic radius (empirical) of the chemical elements on a miniature periodic table spark table Atomic radius (empirical): 140 pm
- Covalent (single bond) radius on a periodic table spark table Molecular single bond covalent radius: 136 (coordination number 2) ppm
- van der Waals radius on a periodic table spark table van der Waals radius: 199 ppm
Tellurium: electronegativities
- Pauling electronegativity of the chemical elements on a miniature periodic table spark table Pauling electronegativity: 2.1 (Pauling units)
- Allred-Rochow electronegativity of the chemical elements on a miniature periodic table spark tableAllred Rochow electronegativity: 2.01 (Pauling units)
- Mulliken-Jaffe electronegativity of the chemical elements on a miniature periodic table spark tableMulliken-Jaffe electronegativity: 2.41 (16.7% s orbital)
Tellurium: orbital properties
- First ionization energy the chemical elements on a miniature periodic table spark table First ionisation energy: 869.30 kJ mol‑1
- Second ionization energy the chemical elements on a miniature periodic table spark table Second ionisation energy: 1795 kJ mol‑1
- Third ionization energy the chemical elements on a miniature periodic table spark table Third ionisation energy: 2686 kJ mol‑1
Tellurium: abundances
- Chemical elements abundance by weight in the universe on a miniature periodic table spark tableUniverse: 9 ppb by weight
- Chemical elements abundance by weight in the earth's crust on a miniature periodic table spark tableCrustal rocks: 1.0 ppb by weight
- Chemical elements abundance by weight in humans on a miniature periodic table spark tableHuman: (no data) ppb by weight
Tellurium: crystal structure
Tellurium: biological data
- Human abundance by weight of the chemical elements on a miniature periodic table spark table Human abundance by weight: (no data) ppb by weight
Tellurium has no biological role. All tellurium compounds are highly toxic.
Tellurium: uses
Tellurium: reactions
Reactions of tellurium as the element with air, water, halogens, acids, and bases where known.
Tellurium: binary compounds
Binary compounds with halogens (known as halides), oxygen (known as oxides), hydrogen (known as hydrides), and other compounds of tellurium where known.
Tellurium: compound properties
Bond strengths; lattice energies of tellurium halides, hydrides, oxides (where known); and reduction potentials where known.
Tellurium: history
Tellurium was discovered by Franz Joseph Muller von Reichstein in 1783 at Romania. Origin of name: from the Latin word "tellus" meaning "earth".Tellurium: isotopes
Tellurium has eight stable isotopes (Te-120 and Te-123 are usually considered stable because of their long half lives) and many of them have a medical application. Te-120 is used for the production of I-120g which has an application as a PET and Beta emitting isotope. Te-122 is used in the production of the radioisotope I-122 which is used in gamma imaging. Te-123 is used for the production of radioactive I-123 which is used in thyroid imaging. Te-124 is used for the production of both I-123 and the PET isotope I-124. Finally, Te-130 is used in the research into double Beta decay.
Tellurium: isolation
Isolation: it is not usually necessary to make tellurium in the laboratory as it is commercially available. While there are some tellurium ores, most tellurium is made as a byproduct of copper refining. Extraction is complex since the method emplyed will depend upon what other compounds or elements are present. The first step usually involves an oxidation in the presence of sodium carbonate (soda ash).
Cu2Te + Na2CO3 + 2O2 → 2CuO + Na2TeO3 + CO2
The tellurite Na2TeO3 is acidified with sulphuric acid and the tellurium precipitates out as the dioxide (leaving and selenous acid, H2SeO3, in solution). Tellurium is liberated from the dioxide by dissolving in sodium hydroxide, NaOH, and electroytic reduction.
TeO2 + 2NaOH → Na2TeO3 + H2O → Te + 2NaOH + O2