WebElements mini logoChemistry: WebElements Periodic Table: Professional Edition: Arsenic: compound data [arsenic (II) sulphide]
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Compounds of arsenic:

arsenic (II) sulphide

  • Formula as commonly written: As4S4
  • Hill system formula: As4S4
  • CAS registry number: [12279-90-2]
  • Formula weight: 427.95
  • Class: sulphide


  • arsenic (II) sulphide
  • arsenic sulphide
  • diarsenic disulphide
  • tetraarsenic tetrasulphide

Physical properties

  • Colour: red
  • Appearance: crystalline solid
  • Melting point: 320°C
  • Boiling point: 565°C
  • Density: 3500 kg m-3


Coming soon...

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
As 70.03 2 [Ar].3d10.4s2.4p1
S 29.97 -2 [Ne].3s2.3p6


Not available

Solid state structure

  • Geometry of arsenic:
  • Prototypical structure:

Crystal structure of arsenic (II) sulphide

Isotope pattern

What follows is the calculated isotope pattern for the As4S4 unit with the most intense ion set to 100%.

Formula: As4S4

mass  %
428 100.0 __________________________________________________
429 3.2 __
430 17.8 _________
431 0.4
432 1.3 _
433 0.0
434 0.0


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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Document served: Tuesday 11th December, 2007