SEARCH Articles Figures Tables Ac actinium Actinium Actinides Actinium abundance Actinium and the actinides Actinium atomic properties Actinium bromide Actinium chemistry Actinium chloride Actinium decay products Actinium decay series Actinium discovery Actinium electron configuration Actinium electron system Actinium electronic structure Actinium elements Actinium emanation Actinium extraction Actinium ground state electronic configuration Actinium half-life Actinium halides Actinium heat capacity Actinium history, occurrence, uses Actinium isotope Actinium isotopes and their properties Actinium longest lived isotope Actinium mass number range Actinium metal Actinium nuclear properties Actinium oxidation state Actinium oxides Actinium physical properties Actinium preparation Actinium production Actinium radioactive decay Actinium radioactive decay series Actinium radionuclides Actinium separation Actinium series Actinium species Actinium stability Actinium thermal properties Actinium transitions Actinium, determination Actinium, properties Actinium-lanthanum experiments Chemistry of Actinium Eka-actinium Isotope actinium family Radioactive series, actinium Radioactive series, actinium thorium Radioactive series, actinium uranium Scandium, Yttrium, Lanthanum and Actinium Scandium, actinium The actinium series Uranium-actinium series Uranium-thorium series isotopes actinium