• 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

    [ 227 ]

    In this table values are given in units of ppb (parts per billion; 1 billion = 109), both in terms of weight and in terms of numbers of atoms. Values for abundances are difficult to determine with much certainty, so all values should be treated with some caution, especially so for the less common elements. Local concentrations of any element can vary from those given here by orders of magnitude.

    View graphsAbundanceppb by weightppb by atoms
    Universe 0 no data
    Sun no data no data
    Meteorite (carbonaceous) no data no data
    Crustal rocks no data no data
    Sea water no data no data
    Stream no data no data
    Human no data no data


    Actinium is found naturally in uranium ores such as pitchblende (mostly UO2). A tonne of pitchblende might yield just about 0.1 g of actinium.

  • AcF3
  • Chlorides
  • AcCl3
  • Bromides
  • AcBr3
  • Iodides
  • AcI3
  • Hydrides
  • AcH2
  • Oxides
  • Ac2O3
  • Sulfides
  • Ac2S3
  • Selenides
    none listed
    none listed
    none listed

    Our data and resources are taken from Web Elements