Einsteinium-252 (Es-252)

Identity

Protons

99

Neutrons

153

Mass number

252

Mass

252 ± 54 u

Mass excess

77.295 MeV

Spin

(4+)

Stability

Half-life: 1.29 years

Natural occurrence

Not found in nature

Decays to

• alpha 78.0 % → Bk-248
• electron capture 22.0 % → Cf-252