H Home Background Color: He Li Be Actinium Main Page Black White Gray B C N O F Ne Na Mg Actinium Pictures Page Al Si P S Cl Ar K Ca Actinium Technical Data Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe Cs Ba La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn Fr Ra Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og

Isotopes of Actinium (click to see decay chain): 206Ac  207Ac  208Ac  209Ac  210Ac  211Ac  212Ac  213Ac  214Ac  215Ac  216Ac  217Ac  218Ac  219Ac  220Ac  221Ac  222Ac  223Ac  224Ac  225Ac  226Ac  227Ac  228Ac  229Ac  230Ac  231Ac  232Ac  233Ac  234Ac  235Ac  236Ac

227Ac     Half-life Boson, 89p 138n 21.772 y Spin 3/2 Parity -1 Show Decay Modes Hide Ultimate Decay Products Yield Nuclide 100.2763136635% 207Pb 8.9×10-8% 205Tl Atomic Weight 227.027752127 Abundance None Mass Excess 25.850941MeV Binding Energy 7.650701MeV Magnetic Moment 1.1 μ Quadrupole Moment 1.7   Show Element Pictures. Show only decay products of this isotope. Show Decay Image Full Size.

Decay chain image generated by Mathematica's GraphPlot and IsotopeData functions from Wolfram Research, Inc..