# Inner electrons
157
# Outer electrons
101
# Protons
258
An-Isotope
101:258
Approval
Stats
BE - Actual
1911.70
BE - Nucleon
7409.67
Decay
A 100, SF+EC+B- 0.003
Element
Half Life
51.5 d
Mass Actual
258.10
Mass Calculated
260.02
Mass H Norm
256.09
Stability