Periodic Table/Neptunium/²²²Np

← 221Np223Np →

²²²Np

Neptunium-222

Radioactive· Half-life: 480 ns

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

93

Neutrons (N)

129

Mass Number (A)

222

Atomic Mass

222.033575AMU

Spin / Parity

1-

Binding E/A

7.389keV

Natural Abundance

Trace / None

Half-life

480 ns

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

α

100.0%

Decay Chain

²²²NpNeptunium480 ns

α100.0%

²¹⁸PaProtactinium108 μs

α100.0%

²¹⁴AcActinium8.20 s

α93.0%

β⁺²¹⁴Ra7.00%

²¹⁰FrFrancium3.18 min

α71.0%

β⁺²¹⁰Rn

²⁰⁶AtAstatine30.6 min

β⁺99.1%

α²⁰²Bi0.90%

²⁰⁶PoPolonium8.80 d

β⁺94.5%

α²⁰²Pb5.45%

²⁰⁶BiBismuth6.24 d

β⁺100.0%

²⁰⁶PbLeadSTABLE

8-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