H Home Background Color: He Li Be Neptunium Main Page Black White Gray B C N O F Ne Na Mg Neptunium Pictures Page Al Si P S Cl Ar K Ca Neptunium 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 Neptunium (click to see decay chain): 225Np  226Np  227Np  228Np  229Np  230Np  231Np  232Np  233Np  234Np  235Np  236Np  237Np  238Np  239Np  240Np  241Np  242Np  243Np  244Np

238Np     Half-life Fermion, 93p 145n 2.116898148148 d Spin 2 Parity 1 Hide Decay Modes Probability Mode Decay Energy Daughter 100% β- 1.291527MeV 238Pu Hide Ultimate Decay Products Yield Nuclide 100.044158759% 206Pb 1.890378×10-6% 205Tl 2.600104×10-9% 208Pb 7.688000628×10-17% 160Dy 5.04402450371×10-21% 140Ce Unknown 172Yb Unknown 152Sm Unknown 180Hf Unknown 176Hf Unknown 156Gd Unknown 168Er Unknown 164Dy Atomic Weight 238.050946405 Abundance None Mass Excess 47.456272MeV Binding Energy 7.566214MeV Magnetic Moment N/A Quadrupole Moment N/A   Show Element Pictures. Also show decay chains leading to this isotope. Show only decays with probability >0.1%. Show Decay Image Full Size.

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