Periodic Table/Neptunium/²²⁸Np

← 227Np229Np →

²²⁸Np

Neptunium-228

Radioactive· Half-life: 1.02 min

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

93

Neutrons (N)

135

Mass Number (A)

228

Atomic Mass

228.036313AMU

Spin / Parity

4+

Binding E/A

7.395keV

Natural Abundance

Trace / None

Half-life

1.02 min

Decay Modesoverview · half-life · α · β⁻ · β⁺

EC

59.0%

α

41.0%

β⁺SF

0.0%

Decay Chain

²²⁸NpNeptunium1.02 min

EC59.0%

α²²⁴Pa41.0%

²²⁸UUranium9.10 min

α97.5%

EC²²⁸Pa2.50%

²²⁴ThThorium1.04 s

α100.0%

2β⁺²²⁴Ra

²²⁰RaRadium18.1 ms

α100.0%

²¹⁶RnRadon29.0 μs

α100.0%

²¹²PoPolonium294 ns

α100.0%

²⁰⁸PbLeadSTABLE

7-step decay chain → stable · Primary path shown · branching ratios indicated

Other Isotopes of Neptunium

219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245

← Back to NeptuniumData: IAEA NDS · ENSDF