H Home Background Color: He Li Be Helium Main Page Black White Gray B C N O F Ne Na Mg Helium Pictures Page Al Si P S Cl Ar K Ca Helium 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 Helium (click to see decay chain): 2He  3He  4He  5He  6He  7He  8He  9He  10He

9He     Half-life Fermion, 2p 7n 7×10-12 ns Spin 1/2 Parity 1 Hide Decay Modes Probability Mode Decay Energy Daughter 100% n 1.2701MeV 8He Show Ultimate Decay Products Atomic Weight 9.043950286 Abundance None Mass Excess 40.939429MeV Binding Energy 3.348637MeV Magnetic Moment N/A Quadrupole Moment N/A   Show Isotope Symbols. Show only decay products of this isotope.

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