Home
background
  • Key data; description
  • History
  • hydrogen around us
  • Uses
  • Geology
  • Biology
  • hydrogen compounds
  • Reactions of hydrogen
  • Compounds
  • Bond enthalpies
  • Radii in compounds
  • Lattice energies
  • Reduction potentials
  • nuclear properties
  • NMR
  • Naturally occurring isotopes
  • Radioisotopes
  • electronic properties
  • Electronic configuration
  • Ionization energies
  • Electron affinities
  • Electronegativities
  • Effective nuclear charges
  • Electron binding energies
  • Atom radii
  • Valence shell radii
  • physical properties
  • Bulk properties (density, resistivity, etc.)
  • Thermal properties (melting point, etc.)
  • Thermodynamic properties
  • crystallography
  • Crystal structure
  • Elements

    PROTACTINIUM
    91
    Pa
    231.03588 (2)


    Name: protactiniumGroup number: 0
    Symbol: PaGroup name: Actinoid
    Atomic number: 91Period number: 7
    Atomic weight: 231.03588 (2)Block: f-block
    CAS Registry ID: 7440-13-3Voice:
    Standard state: solid at 298 KColour: silvery metallic
    Classification: MetallicAvailability:

    protactinium
    This sample of uraninite contains some about 10-6 grammes of actinium at any one time. Image adapted with permission from Prof James Marshall"s (U. North Texas, USA) Walking Tour of the elements CD.

    Protactinium has a bright metallic lustre which it retains for some time in air. The element is superconductive below 1.4 K. The element is a dangerous toxic material and requires precautions similar to those used when handling plutonium. Protactinium is one of the rarest and most expensive naturally occurring elements. The element is an a-emitter and is a radiological hazard similar to polonium. Protactinium is a highly toxic and radioactive rare earth metal that requires special handling. It is found in pitchblende and ores form Zaire and is one of the rarest and most expensive naturally occurring elements.

    Isolation

    Here is a brief summary of the isolation of protactinium.

    coming soon!

    Fluorides
  • PaF4
  • PaF5
  • Chlorides
  • PaCl4
  • PaCl5
  • Bromides
  • PaBr4
  • PaBr5
  • Iodides
  • PaI3
  • PaI4
  • PaI5
  • Hydrides
    none listed
    Oxides
  • PaO
  • PaO2
  • Pa2O5
  • Sulfides
    none listed
    Selenides
    none listed
    Tellurides
    none listed
    Nitrides
    none listed






    Our data and resources are taken from Web Elements