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sillery lustrous gray
General properties
Name, seembol, nummer tellurium, Te, 52
Pronunciation /tɨˈl(j)ʊəriəm/
Element category metalloid
Group, period, block 16 (chalcogens), 5, p
Staundart atomic wicht 127.60
Electron confeeguration [Kr] 4d10 5s2 5p4
2, 8, 18, 18, 6
Electron shells of tellurium (2, 8, 18, 18, 6)
Namin after Roman Tellus, deity of the Earth
Discovery Franz-Joseph Müller von Reichenstein (1782)
First isolation Martin Heinrich Klaproth
Physical properties
Phase solid
Density (near r.t.) 6.24 g·cm−3
Liquid density at m.p. 5.70 g·cm−3
Meltin pynt 722.66 K, 449.51 °C, 841.12 °F
Boilin pynt 1261 K, 988 °C, 1810 °F
Heat o fusion 17.49 kJ·mol−1
Heat o vaporization 114.1 kJ·mol−1
Molar heat capacity 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
Oxidation states 6, 5, 4, 2, -2
(mildly acidic oxide)
Electronegativity 2.1 (Pauling scale)
Ionization energies 1st: 869.3 kJ·mol−1
2nd: 1790 kJ·mol−1
3rd: 2698 kJ·mol−1
Atomic radius 140 pm
Covalent radius 138±4 pm
Van der Waals radius 206 pm
Crystal structure hexagonal[1]
Tellurium has a hexagonal crystal structure
Magnetic orderin diamagnetic[2]
Thermal conductivity (1.97–3.38) W·m−1·K−1
Speed of sound (thin rod) (20 °C) 2610 m·s−1
Young's modulus 43 GPa
Shear modulus 16 GPa
Bulk modulus 65 GPa
Mohs hairdness 2.25
Brinell hairdness 180 MPa
CAS registry nummer 13494-80-9
Most stable isotopes
Main article: 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
· r

Tellurium is a chemical element wi seembol Te an atomic nummer 52. A brittle, mildly toxic, rare, siller-white metalloid which 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 whole 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 an aa due tae its furmation o a volatile hydride which caused the element tae be lost tae space as a gas durin 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.