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

Synthesis

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

Isotope pattern for SeO2

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

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References

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.