Selenium oxidation number

Selenium dioxide is known by the following synonyms:

  • selenium dioxide
  • selenium(IV) oxide
  • selenium oxide

The oxidation number of selenium in selenium dioxide is 4.

  • Formula: SeO2
  • Hill system formula: O2Se1
  • CAS registry number: [7446-08-4]
  • Formula weight: 110.959
  • Class: oxide
  • Colour: white
  • Appearance: crystalline solid
  • Melting point: 340°C
  • Boiling point: 315°C
  • Density: 3950 kg m-3


Selenium(IV) dioxide is formed by the combustion of elemental selenium in a mixture of oxygen and nitrogen dioxide. The yield is about 80%. Selenium(IV) dioxide is a white crystalline material that melts at 340°C.

Solid state structure

  • Geometry of selenium:
  • Prototypical structure:

Element analysis

Element percentages in selenium dioxide
Se 71.16

Isotope pattern for SeO2

THe chart below shows the calculated isotope pattern for the formula SeO2 with the most intense ion set to 100%.


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, 2nd edition, Butterworth, UK, 1997.
  • F.A. Cotton, G. Wilkinson, C.A. Murillo, and M. Bochmann, in, 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, 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, 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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