Protactinium compounds: protactinium pentachloride

protactinium symbol icon

The protactinium in protactinium pentachloride formally is in the oxidation state 5.

Protactinium pentachloride

  • Formula as often written: PaCl5
  • Hill system formula: Cl5Pa1
  • CAS registry number: [13760-41-3]
  • Formula weight: 408.299
  • Class: chloride


  • protactinium pentachloride
  • protactinium(V) chloride
  • protactinium chloride

Physical properties

  • Colour: yellow
  • Appearance: crystalline solid
  • Melting point: 306°C
  • Boiling point: 420
  • Density: 3740 kg m-3


Coming soon...

Element analysis

Element percentages for the elements in protactinium pentachloride
Element %
Cl 43.42
Pa 56.58


Not available

Isotope pattern

What follows is the calculated isotope pattern for the PaCl5 unit with the most intense ion set to 100%.

Formula: Pa1Cl5

mass  %
406  62.5 _______________________________
407 0.0
408 100.0 __________________________________________________
409 0.0
410 64.0 ________________________________
411 0.0
412 20.4 __________
413 0.0
414 3.3 __
415 0.0
416 0.2


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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protactinium atomic number