Element: Tellurium (Te)

Element (Atom) NameTellurium
Physical state at room temperatureSolid
Element ClassificationSemi-metal/metalloid
Group NameChalcogen
Period Number (Periodic table) 5
Group number (Periodic table)16
Atomic number52
Atomic weight127.60 (Ref: Jlab-ele052, Lanl-52, ciaaw-tellurium, Nist-52)
Atomic Radius206 pm (Van der Waals) (Ref: Lanl-52)
Density6.232 g/cm3 (Ref: Jlab-ele052)
Melting point449.51°C (Ref: Jlab-ele052, Lanl-52)
Boiling point988°C (Ref: Jlab-ele052, Lanl-52)
Electron shell configuration1s2 
2s2 2p6 
3s2 3p6 3d10 
4s2 4p6 4d10 
5s2 5p4
Oxidation States+6, +4, -2 (Ref: Jlab-ele052)
6, 5, 4, 3, 2, 1, −1, −2 ​(a mildly acidic oxide) (Ref: Lanl-52)
Ionization Energy9.010 eV (Ref: Jlab-ele052)
9.009808 eV (Ref: Nist-52)
Number of Stable Isotopes5
InChIInChI=1S/Te (Ref: Pubchem-52)


  • Jlab-ele052: https://education.jlab.org/itselemental/ele052.html
  • Lanl-52: https://periodic.lanl.gov/52.shtml
  • ciaaw-tellurium: https://www.ciaaw.org/tellurium.htm
  • Nist-52: https://physics.nist.gov/cgi-bin/Elements/elInfo.pl?element=52
  • Pubchem-52: https://pubchem.ncbi.nlm.nih.gov/element/52
  • science.co.il: https://www.science.co.il/elements/

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