H Home Background Color: He Li Be Lanthanum Main Page Black White Gray B C N O F Ne Na Mg Lanthanum Pictures Page Al Si P S Cl Ar K Ca Lanthanum 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 Lanthanum (click to see decay chain): 117La  118La  119La  120La  121La  122La  123La  124La  125La  126La  127La  128La  129La  130La  131La  132La  133La  134La  135La  136La  137La  138La  139La  140La  141La  142La  143La  144La  145La  146La  147La  148La  149La  150La  151La  152La  153La  154La  155La

138La     Half-life Fermion, 57p 81n 1.021055301877×1011 y Spin 5 Parity 1 Hide Decay Modes Probability Mode Decay Energy Daughter 65.6% β+ 714.75keV 138Ba 34.4% β- 1.0438MeV 138Ce Show Ultimate Decay Products Atomic Weight 137.90711193 Abundance 0.09% Mass Excess -86.524681MeV Binding Energy 8.375164MeV Magnetic Moment 3.713646 μ Quadrupole Moment 0.45   Show Isotope Symbols. Also show decay chains leading to this isotope. Show only decays with probability >0.1%.

Click any isotope in diagram to see its data. Decay chain image generated by Mathematica's GraphPlot and IsotopeData functions from Wolfram Research, Inc..