Np
Neptunium-222
Protons (Z)
93
Neutrons (N)
129
Mass number
222
Half-Life
480.0 ns
Abundance
---
Mass
222.034 u
Mass Excess
31,270.0 keV
Spin
(1-)
Discovered
2020
Binding energy per nucleon
7,603 keV
Neutron separation energy
6,711 keV
Proton separation energy
539 keV
Decay Mode
- α→Protactinium-218100%
Decay chain
- NpNeptunium-222Z 93 · N 129480.0 ns
- α100%
- α100%
- α93%
- α71%
- β⁺99.1%
- β⁺94.55%
- β⁺100%