Es
Einsteinium-257
Protons (Z)
99
Neutrons (N)
158
Mass number
257
Half-Life
7.7 d
Abundance
---
Mass
257.096 u
Mass Excess
89,400.0 keV
Spin
(7/2+)
Discovered
1987
Binding energy per nucleon
7,422 keV
Neutron separation energy
5,861 keV
Proton separation energy
4,929 keV
Decay Mode
Decay chain
- EsEinsteinium-257Z 99 · N 1587.7 d
- β⁻100%
- α99.79%
- β⁻99.69%
- α~100%
- β⁻~100%
- α~100%
- α~100%
- β⁻~100%
- α~100%
- α~100%
- β⁻100%
- α~100%
- α100%
- β⁻100%
- α~100%
- α~100%
- α99.992%
- β⁻97.91%
- α100%
- β⁻100%
- α100%