Tellurium

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Tellurium,  52Te
Tellurium2.jpg
General properties
Appearance sillery lustrous gray
Staundart atomic wecht (Ar, staundart) 127.60(3)
Tellurium in the periodic cairt
Hydrogen Helium
Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon
Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon
Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Airn Cobalt Nickel Capper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Siller (element) Cadmium Indium Tin Antimony Tellurium Iodine Xenon
Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercur (element) Thallium Leid (element) Bismuth Polonium Astatine Radon
Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Ununtrium Flerovium Ununpentium Livermorium Ununseptium Ununoctium
Se

Te

Po
antimonytelluriumiodine
Atomic nummer (Z) 52
Group group 16 (chalcogens)
Period period 5
Element category   metalloid
Block p-block
Electron confeeguration [Kr] 4d10 5s2 5p4
Electrons per shell
2, 8, 18, 18, 6
Pheesical properties
Phase (at STP) solit
Meltin pynt 722.66 K ​(449.51 °C, ​841.12 °F)
Bylin pynt 1261 K ​(988 °C, ​1810 °F)
Density (near r.t.) 6.24 g/cm3
when liquid (at m.p.) 5.70 g/cm3
Heat o fusion 17.49 kJ/mol
Heat o vapourisation 114.1 kJ/mol
Molar heat capacity 25.73 J/(mol·K)
Vapour pressur
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K)     (775) (888) 1042 1266
Atomic properties
Oxidation states 6, 5, 4, 2, -2
(mildly acidic oxide)
Electronegativity Pauling scale: 2.1
Atomic radius empirical: 140 pm
Covalent radius 138±4 pm
Van der Waals radius 206 pm
Color lines in a spectral range
Miscellanea
Creestal structur hexagonal[1]
Hexagonal creestal structur for tellurium
Speed o soond thin rod 2610 m/s (at 20 °C)
Thermal conductivity (1.97–3.38) W/(m·K)
Magnetic orderin diamagnetic[2]
Young's modulus 43 GPa
Shear modulus 16 GPa
Bouk modulus 65 GPa
Mohs haurdness 2.25
Brinell haurdness 180 MPa
CAS Nummer 13494-80-9
History
Diskivery Franz-Joseph Müller von Reichenstein (1782)
First isolation Martin Heinrich Klaproth
Main isotopes o tellurium
Iso­tope Abun­dance Hauf-life (t1/2) Decay mode Pro­duct
120Te 0.09% >2.2×1016 y (β+β+) 120Sn
121Te syn 16.78 d ε 121Sb
122Te 2.55% - (SF)
123Te 0.89% >5×1019 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 ββ 128Xe
129Te syn 69.6 min β 129I
130Te 34.08% 7.9×1020 y ββ 130Xe
Decay modes in parentheses are predictit, but hae nae yet been observed
| references | in Wikidata

Tellurium is a chemical element wi seembol Te an atomic nummer 52. A brickle, mildly toxic, rare, siller-white metalloid that looks seemilar tae tin, tellurium is chemically relatit tae selenium an sulphur. It is occasionally foond in native furm, as elemental crystals. Tellurium is far mair common in the universe as a hale nor it is on Yird. Its extreme rarity in the Yird's crust, comparable tae that o platinum, is pairtly due tae its heich atomic nummer, but it's forbye due tae its furmation o a volatile hydride that caused the element tae be lost tae space as a gas in the het nebular formation o the planet.

References[eedit | eedit soorce]

  1. Tellurium, mindat.org
  2. Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics 81st edition, CRC press.