Periodic Table/Neptunium/²⁴³Np

← 242Np244Np →

²⁴³Np

Neptunium-243

Radioactive· Half-life: 1.85 min

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

93

Neutrons (N)

150

Mass Number (A)

243

Atomic Mass

243.064204AMU

Spin / Parity

5/2+

Binding E/A

7.330keV

Natural Abundance

Trace / None

Half-life

1.85 min

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

β⁻

100.0%

Decay Chain

²⁴³NpNeptunium1.85 min

β⁻100.0%

²⁴³PuPlutonium4.96 h

β⁻100.0%

²⁴³AmAmericium7.35 ky

α100.0%

²³⁹NpNeptunium2.36 d

β⁻100.0%

α²³⁵Pa

²³⁹PuPlutonium24.1 ky

α100.0%

²³⁵UUranium704 My

α100.0%

20Ne²¹⁵Pb8.00%

25Ne²¹⁰Pb8.00%

28Mg²⁰⁷Hg8.00%

²³¹ThThorium1.06 d

β⁻100.0%

²³¹PaProtactinium32.6 ky

α100.0%

24Ne²⁰⁷Tl13.4%

23F²⁰⁸Pb9.90%

²²⁷AcActinium21.8 y

β⁻98.6%

α²²³Fr1.38%

²²⁷ThThorium18.7 d

α100.0%

²²³RaRadium11.4 d

α100.0%

¹⁴C²⁰⁹Pb8.90%

²¹⁹RnRadon3.96 s

α100.0%

²¹⁵PoPolonium1.78 ms

α100.0%

β⁻²¹⁵At2.30%

²¹¹PbLead36.2 min

β⁻100.0%

²¹¹BiBismuth2.14 min

α100.0%

β⁻²¹¹Po0.28%

²⁰⁷TlThallium4.77 min

β⁻100.0%

²⁰⁷PbLeadSTABLE

17-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