Periodic Table/Neptunium/²²⁹Np

← 228Np230Np →

²²⁹Np

Neptunium-229

Radioactive· Half-life: 4.00 min

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

93

Neutrons (N)

136

Mass Number (A)

229

Atomic Mass

229.036287AMU

Spin / Parity

5/2+

Binding E/A

7.399keV

Natural Abundance

Trace / None

Half-life

4.00 min

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

α

68.0%

β⁺

Decay Chain

²²⁹NpNeptunium4.00 min

α68.0%

β⁺²²⁹U

²²⁵PaProtactinium1.71 s

α100.0%

²²¹AcActinium52.0 ms

α100.0%

²¹⁷FrFrancium22.0 μs

α100.0%

²¹³AtAstatine125 ns

α100.0%

²⁰⁹BiBismuth20100000000 Gy

α100.0%

²⁰⁵TlThalliumSTABLE

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

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