WebElements mini logoChemistry: WebElements Periodic Table: Professional Edition: Thallium: compound data [thallium (I) selenide]
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Compounds of thallium:

thallium (I) selenide

  • Formula as commonly written: Tl2Se
  • Hill system formula: Se1Tl2
  • CAS registry number: [15572-25-5]
  • Formula weight: 487.727
  • Class: selenide


  • thallium (I) selenide
  • thallium selenide
  • dithallium selenide

Physical properties

  • Colour: grey
  • Appearance: solid
  • Melting point: 340°C
  • Boiling point:
  • Density: 9050 kg m-3

Element analysis and oxidation numbers

For each compound, and where possible, a formal oxidation number for each element is given, but the usefulness of this number is limited, especially so for p-block elements in particular. Based upon that oxidation number, an electronic configuration is also given but note that for more exotic compounds you should view this as a guide only.
Element % Formal oxidation state Formal electronic configuration
Se 16.19 -2 [Ar].3d10.4s2.4p6
Tl 83.81 1 [Xe].4f14.5d10.6s2


Not available

Isotope pattern

What follows is the calculated isotope pattern for the Tl2Se unit with the most intense ion set to 100%.

Formula: Tl2Se1

mass  %
480   0.2 
481 0.0
482 3.5 __
483 0.2
484 18.8 _________
485 1.0
486 56.1 ____________________________
487 1.1 _
488 100.0 __________________________________________________
489 0.0
490 85.9 ___________________________________________
491 0.0
492 13.8 _______


Coming soon....


The data on these compounds pages are assembled and adapted from the primary literature and several other sources including the following.

  • R.T. Sanderson in Chemical Periodicity, Reinhold, New York, USA, 1960.
  • N.N. Greenwood and A. Earnshaw in Chemistry of the Elements, 2nd edition, Butterworth, UK, 1997.
  • F.A. Cotton, G. Wilkinson, C.A. Murillo, and M. Bochmann, in Advanced Inorganic Chemistry, John Wiley & Sons, 1999.
  • A.F. Trotman-Dickenson, (ed.) in Comprehensive Inorganic Chemistry, Pergamon, Oxford, UK, 1973.
  • R.W.G. Wyckoff, in Crystal Structures, volume 1, Interscience, John Wiley & Sons, 1963.
  • A.R.West in Basic solid state chemistry Chemistry, John Wiley & Sons, 1999.
  • A.F. Wells in Structural inorganic chemistry, 4th edition, Oxford, UK, 1975.
  • J.D.H. Donnay, (ed.) in Crystal data determinative tables, ACA monograph number 5, American Crystallographic Association, USA, 1963.
  • D.R. Lide, (ed.) in Chemical Rubber Company handbook of chemistry and physics, CRC Press, Boca Raton, Florida, USA, 77th edition, 1996.
  • J.W. Mellor in A comprehensive treatise on inorganic and theoretical chemistry, volumes 1-16, Longmans, London, UK, 1922-1937.
  • J.E. Macintyre (ed.) in Dictionary of inorganic compounds, volumes 1-3, Chapman & Hall, London, UK, 1992.
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