H
Home
Background Color:
He
Li
Be
Neptunium Main Page
Black
 
White
 
Gray
B
C
N
O
F
Ne
Na
Mg
Neptunium Pictures Page
Al
Si
P
S
Cl
Ar
K
Ca
Neptunium Technical Data
Sc
Ti
V
Cr
Mn
Fe
Co
Ni
Cu
Zn
Ga
Ge
As
Se
Br
Kr
Rb
Sr
Y
Zr
Nb
Mo
Tc
Ru
Rh
Pd
Ag
Cd
In
Sn
Sb
Te
I
Xe
Cs
Ba
La
Ce
Pr
Nd
Pm
Sm
Eu
Gd
Tb
Dy
Ho
Er
Tm
Yb
Lu
Hf
Ta
W
Re
Os
Ir
Pt
Au
Hg
Tl
Pb
Bi
Po
At
Rn
Fr
Ra
Ac
Th
Pa
U
Np
Pu
Am
Cm
Bk
Cf
Es
Fm
Md
No
Lr
Rf
Db
Sg
Bh
Hs
Mt
Ds
Rg
Cn
Nh
Fl
Mc
Lv
Ts
Og
Isotopes of Neptunium (click to see decay chain):
225
Np
226
Np
227
Np
228
Np
229
Np
230
Np
231
Np
232
Np
233
Np
234
Np
235
Np
236
Np
237
Np
238
Np
239
Np
240
Np
241
Np
242
Np
243
Np
244
Np
229
Np
Half-life
Boson, 93p 136n
4 m
Spin 5/2 Parity 1
Hide Decay Modes
Probability
Mode
Decay Energy
Daughter
50%
β
+
1.5467MeV
229
U
50%
α
7.014MeV
225
Pa
Hide Ultimate Decay Products
Yield
Nuclide
100.197272576%
205
Tl
2.948854721792×10
-10
%
207
Pb
Atomic Weight
229.036263808
Abundance
None
Mass Excess
33.779521MeV
Binding Energy
7.606087MeV
Magnetic Moment
N/A
Quadrupole Moment
N/A
Show Element Pictures.
Also show decay chains leading to this isotope.
Show all decays, even very low-probability.
Show Decay Image Smaller.
Click any isotope in diagram to see its data.
Decay chain image generated by
Mathematica
's
GraphPlot
and
IsotopeData
functions from
Wolfram Research, Inc.
.