| Abundances of the elements | actinium |
| Abundance in carbonaceous meteorites (by weight) | actinium |
| Abundance in carbonaceous meteorites (by atoms) | actinium |
| Abundance in Earth's crust (by weight) | actinium |
| Abundance in Earth's crust (by atoms) | actinium |
| Abundance in iron meteorites (by weight) | actinium |
| Abundance in iron meteorites (by atoms) | actinium |
| Abundance in oceans (by weight) | actinium |
| Abundance in oceans (by atoms) | actinium |
| Abundance in stream water (by weight) | actinium |
| Abundance in stream water (by atoms) | actinium |
| Abundance in the sun (by weight) | actinium |
| Abundance in the sun (by atoms) | actinium |
| Abundance in the universe (by weight) | actinium |
| Abundance in the universe (by atoms) | actinium |
| Abundances in humans (by weight) | actinium |
| Abundances in humans (by atoms) | actinium |
| Atomic radii (Clementi) | actinium |
| Atomc radii (calculated) | actinium |
| Atomic radius (empirical) | actinium |
| Atomic number | actinium |
| Atomic spectra | actinium |
| Biology | actinium |
| Block in periodic table | actinium |
| Boiling point | actinium |
| Boiling point of highest fluoride | actinium |
| Boiling point of hydride | actinium |
| Bond enthalpy (single bond) | actinium |
| Bond enthalpy of diatomic M-Al molecules | actinium |
| Bond enthalpy of diatomic M-Ar molecules | actinium |
| Bond enthalpy of diatomic M-As molecules | actinium |
| Bond enthalpy of diatomic M-B molecules | actinium |
| Bond enthalpy of diatomic M-Ba molecules | actinium |
| Bond enthalpy of diatomic M-Be molecules | actinium |
| Bond enthalpy of diatomic M-Bi molecules | actinium |
| Bond enthalpy of diatomic M-Br molecules | actinium |
| Bond enthalpy of diatomic M-C molecules | actinium |
| Bond enthalpy of diatomic M-Ca molecules | actinium |
| Bond enthalpy of diatomic M-Cl molecules | actinium |
| Bond enthalpy of diatomic M-Cs molecules | actinium |
| Bond enthalpy of diatomic M-F molecules | actinium |
| Bond enthalpy of diatomic M-Fr molecules | actinium |
| Bond enthalpy of diatomic M-Ga molecules | actinium |
| Bond enthalpy of diatomic M-Ge molecules | actinium |
| Bond enthalpy of diatomic M-H molecules | actinium |
| Bond enthalpy of diatomic M-He molecules | actinium |
| Bond enthalpy of diatomic M-I molecules | actinium |
| Bond enthalpy of diatomic M-In molecules | actinium |
| Bond enthalpy of diatomic M-K molecules | actinium |
| Bond enthalpy of diatomic M-Kr molecules | actinium |
| Bond enthalpy of diatomic M-Li molecules | actinium |
| Bond enthalpy of diatomic M-Mg molecules | actinium |
| Bond enthalpy of diatomic M-N molecules | actinium |
| Bond enthalpy of diatomic M-Na molecules | actinium |
| Bond enthalpy of diatomic M-Ne molecules | actinium |
| Bond enthalpy of diatomic M-O molecules | actinium |
| Bond enthalpy of diatomic M-P molecules | actinium |
| Bond enthalpy of diatomic M-Pb molecules | actinium |
| Bond enthalpy of diatomic M-Ra molecules | actinium |
| Bond enthalpy of diatomic M-Rb molecules | actinium |
| Bond enthalpy of diatomic M-Rn molecules | actinium |
| Bond enthalpy of diatomic M-S molecules | actinium |
| Bond enthalpy of diatomic M-Sb molecules | actinium |
| Bond enthalpy of diatomic M-Se molecules | actinium |
| Bond enthalpy of diatomic M-Si molecules | actinium |
| Bond enthalpy of diatomic M-Sn molecules | actinium |
| Bond enthalpy of diatomic M-Sr molecules | actinium |
| Bond enthalpy of diatomic M-Te molecules | actinium |
| Bond enthalpy of diatomic M-Tl molecules | actinium |
| Bond enthalpy of diatomic M-Xe molecules | actinium |
| Bond enthalpy of diatomic molecules | actinium |
| Bond enthalpy of homodinuclear molecules | actinium |
| Bond length in element | actinium |
| Bulk modulus | actinium |
| CAS Registry number | actinium |
| Chemistry | actinium |
| Classification | actinium |
| Colour | actinium |
| Common oxidation numbers | actinium |
| compounds | actinium |
| contents | actinium |
| Covalent radius | actinium |
| covalent radii revisited (2008 values) | actinium |
| Covalent radii (molecular single bond) | actinium |
| Covalent radii (molecular double bond) | actinium |
| Covalent radii (molecular triple bond) | actinium |
| Critical temperature | actinium |
| Crystal structure | actinium |
| Density of solid | actinium |
| Description | actinium |
| Discovery | actinium |
| Discovery | actinium |
| Discovery | actinium |
| Effective nuclear charge (Clementi) | actinium |
| Effective nuclear charge (Clementi) - 1s | actinium |
| Effective nuclear charge (Clementi) - 2p | actinium |
| Effective nuclear charge (Clementi) - 2s | actinium |
| Effective nuclear charge (Clementi) - 3d | actinium |
| Effective nuclear charge (Clementi) - 3p | actinium |
| Effective nuclear charge (Clementi) - 3s | actinium |
| Effective nuclear charge (Clementi) - 4d | actinium |
| Effective nuclear charge (Clementi) - 4f | actinium |
| Effective nuclear charge (Clementi) - 4p | actinium |
| Effective nuclear charge (Clementi) - 4s | actinium |
| Effective nuclear charge (Clementi) - 5d | actinium |
| Effective nuclear charge (Clementi) - 5p | actinium |
| Effective nuclear charge (Clementi) - 5s | actinium |
| Effective nuclear charge (Clementi) - 6p | actinium |
| Effective nuclear charge (Clementi) - 6s | actinium |
| Electrical resistivity | actinium |
| Electron affinity | actinium |
| Electron binding energies | actinium |
| Electron binding energies (K) | actinium |
| Electron binding energies (L-I) | actinium |
| Electron binding energies (L-II) | actinium |
| Electron binding energies (L-III) | actinium |
| Electron binding energies (M-I) | actinium |
| Electron binding energies (M-II) | actinium |
| Electron binding energies (M-III) | actinium |
| Electron binding energies (M-IV) | actinium |
| Electron binding energies (M-V) | actinium |
| Electron binding energies (N-I) | actinium |
| Electron binding energies (N-II) | actinium |
| Electron binding energies (N-III) | actinium |
| Electron binding energies (N-IV) | actinium |
| Electron binding energies (N-V) | actinium |
| Electron binding energies (N-VI) | actinium |
| Electron binding energies (N-VII) | actinium |
| Electron binding energies (O-I) | actinium |
| Electron binding energies (O-II) | actinium |
| Electron binding energies (O-III) | actinium |
| Electron binding energies (O-IV) | actinium |
| Electron binding energies (O-V) | actinium |
| Electron binding energies (P-I) | actinium |
| Electron binding energies (P-II) | actinium |
| Electron binding energies (P-III) | actinium |
| Electron shell structure | actinium |
| electronegativity | actinium |
| Electronegativity (Allen) | actinium |
| Electronegativity (Allred-Rochow) | actinium |
| Electronegativity (Mulliken-Jaffe - s) | actinium |
| Electronegativity (Mulliken-Jaffe - sp) | actinium |
| Electronegativity (Mulliken-Jaffe -sp2) | actinium |
| Electronegativity (Mulliken-Jaffe -sp3) | actinium |
| Electronegativity (Mulliken-Jaffe) | actinium |
| Electronegativity (Mulliken-Jaffe) p-orbital | actinium |
| Electronegativity (Pauling) | actinium |
| Electronegativity (Sanderson) | actinium |
| Electronic configuration | actinium |
| Element names and symbols | actinium |
| Element popularity | actinium |
| Enthalpy of atomization | actinium |
| Enthalpy of fusion | actinium |
| Enthalpy of vaporization | actinium |
| Geology | actinium |
| Group Name | actinium |
| Group numbers | actinium |
| Hardness - Brinell | actinium |
| Hardness - Mineralogical | actinium |
| Hardness - Vickers | actinium |
| Health hazards | actinium |
| History of the element | actinium |
| Hydration enthalpy for metal ion M[I] | actinium |
| Hydration enthalpy for metal ion M[II] | actinium |
| Hydration enthalpy for metal ion M[III] | actinium |
| Hydration enthalpy for metal ion M[IV] | actinium |
| Hydrolysis constant of hydrated metal ion M(I) | actinium |
| Hydrolysis constant of hydrated metal ion M(II) | actinium |
| Hydrolysis constant of hydrated metal ion M(III) | actinium |
| Hydrolysis constant of hydrated metal ion M(IV) | actinium |
| Ionic radii (Shannon) | actinium |
| Ionic radii (Shannon) for 8-coordinate M(-I) ion | actinium |
| Ionic radii (Shannon) for 8-coordinate M(-II) ion | actinium |
| Ionic radii (Shannon) for 8-coordinate M(I) ion | actinium |
| Ionic radii (Shannon) for 8-coordinate M(II) ion | actinium |
| Ionic radii (Shannon) for 8-coordinate M(III) ion | actinium |
| Ionic radii (Shannon) for 8-coordinate M(IV) ion | actinium |
| Ionic radii (Shannon) for 8-coordinate M(V) ion | actinium |
| Ionic radii (Shannon) for 8-coordinate M(VI) ion | actinium |
| Ionic radii (Shannon) for octahedral M(-III) ion | actinium |
| Ionic radii (Shannon) for octahedral M(-II) ion | actinium |
| Ionic radii (Shannon) for octahedral M(-I) ion | actinium |
| Ionic radii (Shannon) for octahedral M(I) ion | actinium |
| Ionic radii (Shannon): low spin octahedral M(II) ion | actinium |
| Ionic radii (Shannon): high spin octahedral M(II) ion | actinium |
| Ionic radii (Shannon): low spin octahedral M(III) ion | actinium |
| Ionic radii (Shannon): high spin octahedral M(III) ion | actinium |
| Ionic radii (Shannon): low spin octahedral M(IV) ion | actinium |
| Ionic radii (Shannon): high spin octahedral M(IV) ion | actinium |
| Ionic radii (Shannon) for octahedral M(V) ion | actinium |
| Ionic radii (Shannon) for octahedral M(VI) ion | actinium |
| Ionic radii (Shannon) for octahedral M(VII) ion | actinium |
| Ionic radii (Shannon) for octahedral M(VIII) ion | actinium |
| Ionic radii (Shannon) for square planar M(I) ion | actinium |
| Ionic radii (Shannon) for square planar M(II) ion | actinium |
| Ionic radii (Shannon) for square planar M(III) ion | actinium |
| Ionic radii (Shannon) for tetrahedral M(-III) ion | actinium |
| Ionic radii (Shannon) for tetrahedral M(-I) ion | actinium |
| Ionic radii (Shannon) for tetrahedral M(-II) ion | actinium |
| Ionic radii (Shannon) for tetrahedral M(I) ion | actinium |
| Ionic radii (Shannon) for tetrahedral M(II) ion | actinium |
| Ionic radii (Shannon) for tetrahedral M(III) ion | actinium |
| Ionic radii (Shannon) for tetrahedral M(IV) ion | actinium |
| Ionic radii (Shannon) for tetrahedral M(V) ion | actinium |
| Ionic radii (Shannon) for tetrahedral M(VI) ion | actinium |
| Ionic radii (Shannon) for tetrahedral M(VII) ion | actinium |
| Ionic radii (Shannon) for tetrahedral M(VIII) ion | actinium |
| Ionic radius (Pauling) | actinium |
| Ionic radius (Pauling) for M(-IV) ion | actinium |
| Ionic radius (Pauling) for M(-III) ion | actinium |
| Ionic radius (Pauling) for M(-II) ion | actinium |
| Ionic radius (Pauling) for M(-I) ion | actinium |
| Ionic radius (Pauling) for M(I) ion | actinium |
| Ionic radius (Pauling) for M(II) ion | actinium |
| Ionic radius (Pauling) for M(III) ion | actinium |
| Ionic radius (Pauling) for M(IV) ion | actinium |
| Ionic radius (Pauling) for M(V) ion | actinium |
| Ionic radius (Pauling) for M(VI) ion | actinium |
| Ionic radius (Pauling) for M(VII) ion | actinium |
| Ionization energies | actinium |
| Ionization energy: 1st | actinium |
| Ionization energy: 2nd | actinium |
| Ionization energy: 3rd | actinium |
| Ionization energy: 4th | actinium |
| Ionization energy: 5th | actinium |
| Ionization energy: 6th | actinium |
| Ionization energy: 7th | actinium |
| Ionization energy: 8th | actinium |
| Ionization energy: 9th | actinium |
| Ionization energy: 10th | actinium |
| Ionization energy: 11th | actinium |
| Ionization energy: 12th | actinium |
| Ionization energy: 13th | actinium |
| Ionization energy: 14th | actinium |
| Ionization energy: 15th | actinium |
| Ionization energy: 16th | actinium |
| Ionization energy: 17th | actinium |
| Ionization energy: 18th | actinium |
| Ionization energy: 19th | actinium |
| Ionization energy: 20th | actinium |
| Ionization energy: 21st | actinium |
| Isolation | actinium |
| Isotopes | actinium |
| Lattice energies | actinium |
| Lattice energies (calculated) for MH | actinium |
| Lattice energies (calculated) for MH2 | actinium |
| Lattice energies (calculated) for MH3 | actinium |
| Lattice energies (calculated) for MH4 | actinium |
| Lattice energies (calculated) for MF | actinium |
| Lattice energies (calculated) for MF2 | actinium |
| Lattice energies (calculated) for MF3 | actinium |
| Lattice energies (calculated) for MF4 | actinium |
| Lattice energies (calculated) for MCl | actinium |
| Lattice energies (calculated) for MCl2 | actinium |
| Lattice energies (calculated) for MCl3 | actinium |
| Lattice energies (calculated) for MCl4 | actinium |
| Lattice energies (calculated) for MBr | actinium |
| Lattice energies (calculated) for MBr2 | actinium |
| Lattice energies (calculated) for MBr3 | actinium |
| Lattice energies (calculated) for MBr4 | actinium |
| Lattice energies (calculated) for MI | actinium |
| Lattice energies (calculated) for MI2 | actinium |
| Lattice energies (calculated) for MI3 | actinium |
| Lattice energies (calculated) for MI4 | actinium |
| Lattice energies (calculated) for M2O | actinium |
| Lattice energies (calculated) for MO | actinium |
| Lattice energies (calculated) for M2O2 | actinium |
| Lattice energies (calculated) for M2O3 | actinium |
| Lattice energies (calculated) for MO2 | actinium |
| Lattice energies (calculated) for MO3 | actinium |
| Lattice energies (thermochemical cycle) for MH | actinium |
| Lattice energies (thermochemical cycle) for MH2 | actinium |
| Lattice energies (thermochemical cycle) for MH3 | actinium |
| Lattice energies (thermochemical cycle) for MH4 | actinium |
| Lattice energies (thermochemical cycle) for MF | actinium |
| Lattice energies (thermochemical cycle) for MF2 | actinium |
| Lattice energies (thermochemical cycle) for MF3 | actinium |
| Lattice energies (thermochemical cycle) for MF4 | actinium |
| Lattice energies (thermochemical cycle) for MCl | actinium |
| Lattice energies (thermochemical cycle) for MCl2 | actinium |
| Lattice energies (thermochemical cycle) for MCl3 | actinium |
| Lattice energies (thermochemical cycle) for MCl4 | actinium |
| Lattice energies (thermochemical cycle) for MBr | actinium |
| Lattice energies (thermochemical cycle) for MBr2 | actinium |
| Lattice energies (thermochemical cycle) for MBr3 | actinium |
| Lattice energies (thermochemical cycle) for MBr4 | actinium |
| Lattice energies (thermochemical cycle) for MI | actinium |
| Lattice energies (thermochemical cycle) for MI2 | actinium |
| Lattice energies (thermochemical cycle) for MI3 | actinium |
| Lattice energies (thermochemical cycle) for MI4 | actinium |
| Lattice energies (thermochemical cycle) for M2O | actinium |
| Lattice energies (thermochemical cycle) for MO | actinium |
| Lattice energies (thermochemical cycle) for M2O2 | actinium |
| Lattice energies (thermochemical cycle) for M2O3 | actinium |
| Lattice energies (thermochemical cycle) for MO2 | actinium |
| Lattice energies (thermochemical cycle) for MO3 | actinium |
| Linear expansion coefficient | actinium |
| Liquid Range | actinium |
| Meaning of name | actinium |
| Melting point | actinium |
| Melting point of the highest fluoride | actinium |
| Melting point of the hydride | actinium |
| Menu to displays of periodic properties | actinium |
| Molar volume | actinium |
| NMR data | actinium |
| Orbital properties | actinium |
| Period numbers | actinium |
| Poisson's ratio | actinium |
| Properties of some compounds | actinium |
| Radius - metallic (12) | actinium |
| Reactions of the elements | actinium |
| Reduction potential of hydrated M(I) ions | actinium |
| Reduction potential of hydrated M(II) ions | actinium |
| Reduction potential of hydrated M(III) ions | actinium |
| Reduction potential of hydrated M(IV) ions | actinium |
| Reflectivity | actinium |
| Refractive index | actinium |
| Rigidity modulus | actinium |
| Single bond enthalpy in highest bromide | actinium |
| Single bond enthalpy in highest chloride | actinium |
| Single bond enthalpy in highest fluoride | actinium |
| Single bond enthalpy in highest iodide | actinium |
| Standard atomic weights | actinium |
| standard reduction potentials | actinium |
| Standard state | actinium |
| Superconductivity temperature | actinium |
| Term symbol | actinium |
| Thermal conductivity | actinium |
| thermochemistry | actinium |
| Thermodynamic properties | actinium |
| Total mass in 70 kg human | actinium |
| Uses | actinium |
| valence orbital R(max) | actinium |
| valence s-orbital R(max) | actinium |
| valence p-orbital R(max) | actinium |
| valence d-orbital R(max) | actinium |
| valence f-orbital R(max) | actinium |
| valence s-orbital R(max) | actinium |
| valence p-orbital R(max) | actinium |
| valence d-orbital R(max) | actinium |
| valence f-orbital R(max) | actinium |
| Van der Waals radius | actinium |
| Velocity of sound | actinium |
| X-ray mass absorption coefficients | actinium |
| X-ray mass absorption coefficients (Ag-Kα) | actinium |
| X-ray mass absorption coefficients (Co-Kα) | actinium |
| X-ray mass absorption coefficients (Cr-Kα) | actinium |
| X-ray mass absorption coefficients (Cu-Kα) | actinium |
| X-ray mass absorption coefficients (Fe-Kα) | actinium |
| X-ray mass absorption coefficients (Mo-Kα) | actinium |
| X-ray mass absorption coefficients (Ni-Kα) | actinium |
| X-ray mass absorption coefficients (W-Lα) | actinium |
| Young's modulus | actinium |