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

237Np     Half-life Boson, 93p 144n 2.144×106 y Spin 5/2 Parity 1 Hide Decay Modes Probability Mode Decay Energy Daughter 100% α 4.95826MeV 233Pa 2×10-10% SF N/A Variable 4×10-12% 30Mg N/A 207Tl Hide Ultimate Decay Products Yield Nuclide 100.0128000001% 205Tl 6.9366176×10-10% 207Pb Atomic Weight 237.048173444 Abundance None Mass Excess 44.873275MeV Binding Energy 7.574982MeV Magnetic Moment 3.14 μ Quadrupole Moment 3.886   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..