Einsteinium-255 (Es-255)

Identity

Protons

99

Neutrons

156

Mass number

255

Mass

255 ± 12 u

Mass excess

84.089 MeV

Spin

(7/2+)

Stability

Half-life: 39.8 days

Natural occurrence

Not found in nature

Decays to

• beta minus 92.0 % → Fm-255 (no page)
• alpha 8.0 % → Bk-251 (no page)
• spontaneous fission 0.0041 %