H Home Background Color: He Li Be Magnesium Main Page Black White Gray B C N O F Ne Na Mg Magnesium Pictures Page Al Si P S Cl Ar K Ca Magnesium 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 Magnesium (click to see decay chain): 19Mg  20Mg  21Mg  22Mg  23Mg  24Mg  25Mg  26Mg  27Mg  28Mg  29Mg  30Mg  31Mg  32Mg  33Mg  34Mg  35Mg  36Mg  37Mg  38Mg  39Mg  40Mg

21Mg     Half-life Fermion, 12p 9n 122 ms Spin 5/2 Parity 1 Show Decay Modes Show Ultimate Decay Products Atomic Weight 21.01171291 Abundance None Mass Excess 10.910506MeV Binding Energy 7.104714MeV 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%.

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