Arsenic 33 As 74.92160(2)   Switch element to... actinium aluminium aluminum americium antimony argon arsenic astatine barium berkelium beryllium bismuth bohrium boron bromine cadmium caesium calcium californium carbon cerium cesium chlorine chromium cobalt copper curium darmstadtium dubnium dysprosium einsteinium erbium europium fermium fluorine francium gadolinium gallium germanium gold hafnium hassium helium holmium hydrogen indium iodine iridium iron krypton lanthanum lawrencium lead lithium lutetium magnesium manganese meitnerium mendelevium mercury molybdenum neodymium neon neptunium nickel niobium nitrogen nobelium osmium oxygen palladium phosphorus platinum plutonium polonium potassium praseodymium promethium protactinium radium radon rhenium rhodium roentgenium rubidium ruthenium rutherfordium samarium scandium seaborgium selenium silicon silver sodium strontium sulfur sulphur tantalum technetium tellurium terbium thallium thorium thulium tin titanium tungsten ununbium ununhexium ununoctium ununpentium ununquadium ununtrium uranium vanadium xenon ytterbium yttrium zinc zirconium Go adjacent... Si P S Ge As Se Sn Sb Te

Compounds of arsenic:

arsenic (III) selenide

• Formula as commonly written: As₂Se₃
• Hill system formula: As₂Se₃
• CAS registry number: [1303-36-2]
• Formula weight: 386.723
• Class: selenide

Synonyms

• arsenic (III) selenide
• arsenic selenide
• diarsenic triselenide

Physical properties

• Colour: brown-black
• Appearance: solid
• Melting point: 260°C
• Boiling point:
• Density: 4750 kg m^-3

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Element analysis and oxidation numbers

Synthesis

Not available

Solid state structure

• Geometry of arsenic:
• Prototypical structure:

Isotope pattern

What follows is the calculated isotope pattern for the As₂Se₃ unit with the most intense ion set to 100%.

Formula: As₂Se₃

mass  %
374   0.0 
375   0.0 
376   0.1 
377   0.0 
378   0.9 
379   0.1 
380   4.5 __
381   0.6 
382  15.8 ________
383   1.6 _
384  40.3 ____________________
385   2.7 _
386  76.2 ______________________________________
387   3.1 __
388 100.0 __________________________________________________
389   1.0 
390  88.2 ____________________________________________
391   0.1 
392  34.5 _________________
393   0.0 
394   5.9 ___
395   0.0 
396   0.4 

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 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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