Periodic Table of Elements

Es - Einsteinium

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Nuclides / Isotopes

Nuc-
lide
Atomic
Mass
NNAbun
%
SpinHalf LifeDMDTBR
%
Decay
Energy
(MeV)
Es240240.069141Syn      
Es241241.069142Syn 9s    
Es242242.07143Syn 40sεCf242 5.600
Es243243.07144Syn 21sεCf243<=704.000
 21sαBk239>=308.072
Es244244.07145Syn 37sεCf244964.560
 37sαBk24047.950
Es245245.071146Syn3/2-1.1mεCf245603.050
 1.1mαBk2417.47.909
Es246246.0729147Syn4-, 6+7.7mεCf24690.13.880
 7.7mαBk2429.97.740
Es247247.0737148Syn7/2+4.55mεCf247~932.480
 4.55mαBk242~77.490
Es248248.0755149Syn2-, 0+27mεCf248>993.060
 27mαBk244~0.257.166
Es249249.0764150Syn7/2+102.2mεCf24999.431.450
 102.2mαBk2450.576.940
Es250250.079151Syn6+8.6hεCf250>972.100
 8.6hαBk246<36.880
meta state 0.000MeVSyn1-2.22hεCf250>=992.100
 2.22hαBk246<=16.880
Es251251.08152Syn3/2-33hεCf25199.510.376
 33hαBk2470.496.597
Es252252.083153Syn5-471.7dαBk248766.760
 471.7dεCf252241.260
 471.7dβ-Fm252~0.010.480
Es253253.0848154Syn7/2+20.47dSF 8.7E -6 
 20.47dαBk249 6.739
Es254254.088155Syn7+275.7dεCf254<0.00010.654
 275.7dβ-Fm2541.7E -61.090
 275.7dαBk250 6.628
meta state 0.078MeVSyn2+39.3hβ-Fm254981.168
 39.3hITEs254<30.078
 39.3hαBk2500.336.696
 39.3hεCf2540.080.732
 39.3hSF <0.05 
Es255255.0903156Syn7/2+39.8dβ-Fm255920.288
 39.8dαBk25186.436
 39.8dSF 0.0041 
Es256256.094157Syn1+25.4mβ-Fm256 1.670
meta state 0.000MeVSyn8+~7.6hβ-Fm256 1.670
Es257257.096158Syn  SF   
NuclidePotential Parent Nuclides
Es240None known
Es241None known
Es242None known
Es243Md247 (Syn)
Es244Md248 (Syn)
Es245Md249 (Syn)
Es246Fm246 (Syn) Md250 (Syn)
Es247Fm247 (Syn) Md251 (Syn)
Es248Fm248 (Syn)
Es249Fm249 (Syn)
Es250Fm250 (Syn)
meta state 0.000MeVNone known
Es251Fm251 (Syn) Md255 (Syn)
Es252Md256 (Syn)
Es253Cf253 (Syn) Fm253 (Syn) Md257 (Syn)
Es254Es254m (Syn) Md258m (Syn)
meta state 0.078MeVNone known
Es255Cf255 (Syn) Md259 (Syn)
Es256Cf256 (Syn) Md260 (Syn)
meta state 0.000MeVNone known
Es257None known

Key:

  • NN = Number of Neutrons
  • Abun % = Natural Abundance (as a percentage)
  • Syn = Synthetic Nuclide (does not occur in nature)
  • DM = Decay Mode
    α = Alpha emission
    β- = Beta emission
    β- β- = Double beta decay
    β+ = Positron emission
    ε = Electron Capture
    IT = Isomeric Transition
    N = Neutron emission
    P = Proton emission
    SF = Spontaneous Fission
  • DT = Decays To
  • BR % = Branch Ratio (as a percentage)

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