Isotopes of Neptunium (Np)

Symbol Mass Number Relative Atomic Mass Isotopic Composition
225Np 225 225.033910(80)
226Np 226 226.03515(10)#
227Np 227 227.034960(80)
228Np 228 228.03618(21)#
229Np 229 229.036260(90)
230Np 230 230.037830(60)
231Np 231 231.038250(50)
232Np 232 232.04011(11)#
233Np 233 233.040740(50)
234Np 234 234.042895(9)
235Np 235 235.0440633(21)
236Np 236 236.046570(50)
237Np 237 237.0481734(20)
238Np 238 238.0509464(20)
239Np 239 239.0529390(22)
240Np 240 240.056162(16)
241Np 241 241.058250(80)
242Np 242 242.06164(21)
243Np 243 243.064280(30)#
244Np 244 244.06785(32)#

Legend

Mass Number
Relative Atomic Mass
Isotopic Composition
Standard Atomic Weight
Np: [237]