Periodic Table/Neptunium/²²⁰Np

← 219Np221Np →

²²⁰Np

Neptunium-220

Radioactive· Half-life: 29.0 ns

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

93

Neutrons (N)

127

Mass Number (A)

220

Atomic Mass

220.032716AMU

Spin / Parity

1-

Binding E/A

7.386keV

Natural Abundance

Trace / None

Half-life

29.0 ns

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

α

100.0%

Decay Chain

²²⁰NpNeptunium29.0 ns

α100.0%

²¹⁶PaProtactinium105 ms

α100.0%

β⁺²¹⁶Th

²¹²AcActinium895 ms

α100.0%

β⁺²¹²Ra

²⁰⁸FrFrancium59.1 s

α89.0%

β⁺²⁰⁸Rn11.0%

²⁰⁴AtAstatine9.12 min

β⁺96.2%

α²⁰⁰Bi3.80%

²⁰⁴PoPolonium3.52 h

β⁺99.3%

α²⁰⁰Pb0.67%

²⁰⁴BiBismuth11.2 h

β⁺100.0%

²⁰⁴PbLeadSTABLE

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

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