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Es
Einsteinium
18 known isotopes (0 stable,
18 radioactive)
240Es
Mass
240.068949 u
Abundance —
Half-life 6 seconds
Spin/Parity (1+)
Decay Mode(s) α (70%), EC/β⁺ (30%), ECSF (4.8%)
241Es
Mass
241.068592 u
Abundance —
Half-life 8 seconds
Spin/Parity —
Decay Mode(s) Unknown
242Es
Mass
242.069567 u
Abundance —
Half-life 17.8 seconds
Spin/Parity —
Decay Mode(s) α (57%), EC/β⁺ (43%)
243Es
Mass
243.069508 u
Abundance —
Half-life 21 seconds
Spin/Parity (7/2+)
Decay Mode(s) α (61%), EC/β⁺ (39%), Spontaneous fission (1%)
244Es
Mass
244.070881 u
Abundance —
Half-life 37 seconds
Spin/Parity —
Decay Mode(s) Electron capture (96%), α (4%)
245Es
Mass
245.071192 u
Abundance —
Half-life 1.1 m
Spin/Parity (3/2-)
Decay Mode(s) Electron capture (60%), α (40%)
246Es
Mass
246.072806 u
Abundance —
Half-life 7.5 m
Spin/Parity —
Decay Mode(s) EC/β⁺ (90.1%), α (9.9%)
247Es
Mass
247.073622 u
Abundance —
Half-life Unknown
Spin/Parity (3/2-)
Decay Mode(s) Unknown
248Es
Mass
248.075469 u
Abundance —
Half-life 24 m
Spin/Parity (2- 0+)
Decay Mode(s) Electron capture (99.7%), α (0.25%)
249Es
Mass
249.076409 u
Abundance —
Half-life 102.2 m
Spin/Parity 7/2+
Decay Mode(s) EC/β⁺ (99.43%), α (0.57%)
250Es
Mass
250.078611 u
Abundance —
Half-life 8.6 h
Spin/Parity (6+)
Decay Mode(s) Electron capture (97%), α (3%)
251Es
Mass
251.079991 u
Abundance —
Half-life 33 h
Spin/Parity 3/2-
Decay Mode(s) Electron capture (99.5%), α (0.5%)
252Es
Mass
252.082979 u
Abundance —
Half-life 471.7 d
Spin/Parity (5-)
Decay Mode(s) α (78%), Electron capture (22%)
253Es
Mass
253.084821 u
Abundance —
Half-life 20.47 d
Spin/Parity 7/2+
Decay Mode(s) α (100%), Spontaneous fission (0.0000087%)
254Es
Mass
254.088024 u
Abundance —
Half-life 275.7 d
Spin/Parity (7+)
Decay Mode(s) α (100%), β⁻ (0.000174%), Spontaneous fission (0.000003%)
255Es
Mass
255.090274 u
Abundance —
Half-life 39.8 d
Spin/Parity (7/2+)
Decay Mode(s) β⁻ (92%), α (8%), Spontaneous fission (0.0041%)
256Es
Mass
256.093597 u
Abundance —
Half-life 25.4 m
Spin/Parity (1+ 0-)
Decay Mode(s) β⁻ (100%)
257Es
Mass
257.095979 u
Abundance —
Half-life 7.7 d
Spin/Parity —
Decay Mode(s) Unknown
Decay mode abbreviations:
β⁻ = Beta minus decay, β⁺ = Beta plus decay, EC = Electron capture, α = Alpha decay
n = Neutron emission, p = Proton emission, SF = Spontaneous fission, IT = Isomeric transition
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