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Tellurium,  52Te
General properties
Name, seembol tellurium, Te
Appearance sillery lustrous gray
Pronunciation /tˈlʲʊəriəm/
Tellurium in the periodic cairt
Hydrogen (diatomic nonmetal)
Helium (noble gas)
Lithium (alkali metal)
Beryllium (alkaline yird metal)
Boron (metalloid)
Carbon (polyatomic nonmetal)
Nitrogen (diatomic nonmetal)
Oxygen (diatomic nonmetal)
Fluorine (diatomic nonmetal)
Neon (noble gas)
Sodium (alkali metal)
Magnesium (alkaline yird metal)
Aluminium (post-transeetion metal)
Silicon (metalloid)
Phosphorus (polyatomic nonmetal)
Sulfur (polyatomic nonmetal)
Chlorine (diatomic nonmetal)
Argon (noble gas)
Potassium (alkali metal)
Calcium (alkaline yird metal)
Scandium (transeetion metal)
Titanium (transeetion metal)
Vanadium (transeetion metal)
Chromium (transeetion metal)
Manganese (transeetion metal)
Airn (transeetion metal)
Cobalt (transeetion metal)
Nickel (transeetion metal)
Capper (transeetion metal)
Zinc (transeetion metal)
Gallium (post-transeetion metal)
Germanium (metalloid)
Arsenic (metalloid)
Selenium (polyatomic nonmetal)
Bromine (diatomic nonmetal)
Krypton (noble gas)
Rubidium (alkali metal)
Strontium (alkaline yird metal)
Yttrium (transeetion metal)
Zirconium (transeetion metal)
Niobium (transeetion metal)
Molybdenum (transeetion metal)
Technetium (transeetion metal)
Ruthenium (transeetion metal)
Rhodium (transeetion metal)
Palladium (transeetion metal)
Siller (transeetion metal)
Cadmium (transeetion metal)
Indium (post-transeetion metal)
Tin (post-transeetion metal)
Antimony (metalloid)
Tellurium (metalloid)
Iodine (diatomic nonmetal)
Xenon (noble gas)
Caesium (alkali metal)
Barium (alkaline yird metal)
Lanthanum (lanthanide)
Cerium (lanthanide)
Praseodymium (lanthanide)
Neodymium (lanthanide)
Promethium (lanthanide)
Samarium (lanthanide)
Europium (lanthanide)
Gadolinium (lanthanide)
Terbium (lanthanide)
Dysprosium (lanthanide)
Holmium (lanthanide)
Erbium (lanthanide)
Thulium (lanthanide)
Ytterbium (lanthanide)
Lutetium (lanthanide)
Hafnium (transeetion metal)
Tantalum (transeetion metal)
Tungsten (transeetion metal)
Rhenium (transeetion metal)
Osmium (transeetion metal)
Iridium (transeetion metal)
Platinum (transeetion metal)
Gold (transeetion metal)
Mercur (transeetion metal)
Thallium (post-transeetion metal)
Leid (post-transeetion metal)
Bismuth (post-transeetion metal)
Polonium (post-transeetion metal)
Astatine (metalloid)
Radon (noble gas)
Francium (alkali metal)
Radium (alkaline yird metal)
Actinium (actinide)
Thorium (actinide)
Protactinium (actinide)
Uranium (actinide)
Neptunium (actinide)
Plutonium (actinide)
Americium (actinide)
Curium (actinide)
Berkelium (actinide)
Californium (actinide)
Einsteinium (actinide)
Fermium (actinide)
Mendelevium (actinide)
Nobelium (actinide)
Lawrencium (actinide)
Rutherfordium (transeetion metal)
Dubnium (transeetion metal)
Seaborgium (transeetion metal)
Bohrium (transeetion metal)
Hassium (transeetion metal)
Meitnerium (unkent chemical properties)
Darmstadtium (unkent chemical properties)
Roentgenium (unkent chemical properties)
Copernicium (transeetion metal)
Ununtrium (unkent chemical properties)
Flerovium (post-transeetion metal)
Ununpentium (unkent chemical properties)
Livermorium (unkent chemical properties)
Ununseptium (unkent chemical properties)
Ununoctium (unkent chemical properties)


Atomic nummer (Z) 52
Group, block group 16 (chalcogens), p-block
Period period 5
Element category   metalloid
Staundart atomic wicht (Ar) 127.60
Electron configuration [Kr] 4d10 5s2 5p4
per shell
2, 8, 18, 18, 6
Pheesical properties
Phase solid
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
Creestal structur hexagonal[1]
Hexagonal crystal 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
Diskivery Franz-Joseph Müller von Reichenstein (1782)
First isolation Martin Heinrich Klaproth
Maist stable isotopes o tellurium
iso NA hauf-life DM DE (MeV) DP
120Te 0.09% >2.2×1016 y (β+β+) 1.701 120Sn
121Te syn 16.78 d ε 1.040 121Sb
122Te 2.55% - (SF) <30.974
123Te 0.89% >5×1019 y (ε) 0.051 123Sb
124Te 4.74% - (SF) <28.221
125Te 7.07% - (SF) <26.966
126Te 18.84% - (SF) <26.011
127Te syn 9.35 h β 0.698 127I
128Te 31.74% 2.2×1024 y ββ 0.867 128Xe
129Te syn 69.6 min β 1.498 129I
130Te 34.08% 7.9×1020 y ββ 2.528 130Xe
Decay modes in parentheses are predictit, but hae nae yet been observed
· references

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