Neptunium

Neptunium (Np)

chemical element with the atomic number of 93 and symbol Np
Atomic Number93
Atomic Weight237
Massagetal219
Group
Period7
Blockf
proton93 p+
neutron126 n0
elektron93 e-
Animated Bohr model of Np (Neptunium)

Physical Property

Atoomradius
175 pm
molar volume
Covalent Radius
171 pm
Metallic Radius
Ioonradius
110 pm
Crystal Radius
124 pm
Van der Waals radius
239 pm
density
20,2 g/cm³
Atomic Radii Of The Elements: Neptunium0153045607590105120135150165180195210225240pmAtoomradiusCovalent RadiusMetallic RadiusVan der Waals radius

Chemical Property

energie
proton affinity
electron affinity
ionization energy
ionization energy of Np (Neptunium)
Verdampingswarmte
336 kJ/mol
smeltingswarmte
9,6 kJ/mol
Vormingsentalpie
464,8 kJ/mol
elektron
Elektronskil2, 8, 18, 32, 22, 9, 2
Bohr model: Np (Neptunium)
Valenselektrone2
Lewisteorie: Np (Neptunium)
elektronkonfigurasie[Rn] 5f4 6d1 7s2
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 5f4 6d1 7s2
Enhanced Bohr model of Np (Neptunium)
Orbital Diagram of Np (Neptunium)
Oksidasietoestand2, 3, 4, 5, 6, 7
Elektronegatiwiteit
1.3
Electrophilicity Index
fundamental state of matter
phase of matterSolid
gaseous state of matter
Boiling Point
Melting Point
917,15 K
critical pressure
critical temperature
triple point
appearance
kleur
Silver
appearancesilvery metallic
Brekingsindeks
thermodynamic material property
Thermal Conductivity
thermal expansion
molar heat capacity
Specific Heat Capacity
heat capacity ratio
electrical properties
typeConductor
Geleidingsvermoë
0,83 MS/m
Elektriese resistiwiteit
0,0000012 m Ω
superconductivity
Magnetisme
type
magnetic susceptibility (Mass)
magnetic susceptibility (Molar)
magnetic susceptibility (Volume)
magnetic ordering
Curie temperature
Néel temperature
structure
Crystal StructureSimple Orthorhombic (ORC)
lattice constant
4,72 Å
Lattice Anglesπ/2, π/2, π/2
mechanical property
hardness
Massamodulus
Skuifmodulus
Young se modulus
Poisson se verhouding
Spoed van klank
classification
CategoryActinides, Actinides
CAS Group
IUPAC Group
Glawe Number37
Mendeleev Number22
Pettifor Number44
Geochemical Class
Goldschmidt classificationsynthetic

other

Gas Basicity
polarizability
151 ± 20 a₀
C6 Dispersion Coefficient
allotrope
Neutron cross section
180
Neutron Mass Absorption
quantum number6L11/2
Ruimtegroep62 (Pnma)

Isotopes of Neptunium

Stable Isotopes0
Unstable Isotopes27
Natural Isotopes0

219Np

Massagetal219
neutron number126
relative atomic mass
219,031601865 ± 0,000098732 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
570 ± 450 us
spin9/2
nuclear quadrupole moment
ontdekkingsdatum2015
parity-

decay modeintensity
α (α emission)100%

220Np

Massagetal220
neutron number127
relative atomic mass
220,03271628 ± 0,000032977 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
29 ± 11 ns
spin1
nuclear quadrupole moment
ontdekkingsdatum2019
parity-

decay modeintensity
α (α emission)100%

221Np

Massagetal221
neutron number128
relative atomic mass
221,03211 ± 0,000215 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
spin9/2
nuclear quadrupole moment
ontdekkingsdatum
parity-

decay modeintensity
α (α emission)

222Np

Massagetal222
neutron number129
relative atomic mass
222,033574706 ± 0,000040849 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
480 ± 190 ns
spin1
nuclear quadrupole moment
ontdekkingsdatum2020
parity-

decay modeintensity
α (α emission)100%

223Np

Massagetal223
neutron number130
relative atomic mass
223,03291334 ± 0,000088956 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
2,5 ± 0,8 us
spin9/2
nuclear quadrupole moment
ontdekkingsdatum2017
parity-

decay modeintensity
α (α emission)100%

224Np

Massagetal224
neutron number131
relative atomic mass
224,03438803 ± 0,000031052 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
48 ± 19 us
spin2
nuclear quadrupole moment
ontdekkingsdatum2018
parity-

decay modeintensity
α (α emission)100%

225Np

Massagetal225
neutron number132
relative atomic mass
225,033943422 ± 0,000098355 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
6,5 ± 3,5 ms
spin9/2
nuclear quadrupole moment
ontdekkingsdatum1994
parity-

decay modeintensity
α (α emission)100%
β+ (β+ decay; β+ = ϵ + e+)

226Np

Massagetal226
neutron number133
relative atomic mass
226,035230364 ± 0,000109568 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
35 ± 10 ms
spin
nuclear quadrupole moment
ontdekkingsdatum1990
parity

decay modeintensity
α (α emission)100%
β+ (β+ decay; β+ = ϵ + e+)

227Np

Massagetal227
neutron number134
relative atomic mass
227,034975012 ± 0,000082651 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
510 ± 60 ms
spin5/2
nuclear quadrupole moment
ontdekkingsdatum1990
parity+

decay modeintensity
α (α emission)100%
β+ (β+ decay; β+ = ϵ + e+)

228Np

Massagetal228
neutron number135
relative atomic mass
228,036313 ± 0,000108 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
61,4 ± 1,4 s
spin4
nuclear quadrupole moment
ontdekkingsdatum1994
parity+

decay modeintensity
ϵ (electron capture)59%
α (α emission)41%
β+ SF (β+-delayed fission)0.012%

229Np

Massagetal229
neutron number136
relative atomic mass
229,036287269 ± 0,000108618 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
4 ± 0,18 m
spin5/2
nuclear quadrupole moment
ontdekkingsdatum1968
parity+

decay modeintensity
α (α emission)68%
β+ (β+ decay; β+ = ϵ + e+)

230Np

Massagetal230
neutron number137
relative atomic mass
230,03782806 ± 0,000059051 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
4,6 ± 0,3 m
spin4
nuclear quadrupole moment
ontdekkingsdatum1968
parity+

decay modeintensity
β+ (β+ decay; β+ = ϵ + e+)97%
α (α emission)3%

231Np

Massagetal231
neutron number138
relative atomic mass
231,038243598 ± 0,000054916 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
48,8 ± 0,2 m
spin5/2
nuclear quadrupole moment
ontdekkingsdatum1950
parity+

decay modeintensity
β+ (β+ decay; β+ = ϵ + e+)98%
α (α emission)2%

232Np

Massagetal232
neutron number139
relative atomic mass
232,040107 ± 0,000107 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
14,7 ± 0,3 m
spin5
nuclear quadrupole moment
ontdekkingsdatum1950
parity-

decay modeintensity
β+ (β+ decay; β+ = ϵ + e+)100%
α (α emission)

233Np

Massagetal233
neutron number140
relative atomic mass
233,040739421 ± 0,000054729 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
36,2 ± 0,1 m
spin5/2
nuclear quadrupole moment
ontdekkingsdatum1950
parity+

decay modeintensity
β+ (β+ decay; β+ = ϵ + e+)100%
α (α emission)0.0007%

234Np

Massagetal234
neutron number141
relative atomic mass
234,042893245 ± 0,000009014 Da
g-factor
0
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
4,4 ± 0,1 d
spin0
nuclear quadrupole moment
0
ontdekkingsdatum1949
parity+

decay modeintensity
β+ (β+ decay; β+ = ϵ + e+)100%

235Np

Massagetal235
neutron number142
relative atomic mass
235,044061518 ± 0,00000149 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
396,1 ± 1,2 d
spin5/2
nuclear quadrupole moment
ontdekkingsdatum1949
parity+

decay modeintensity
ϵ (electron capture)99.9974%
α (α emission)0.0026%

236Np

Massagetal236
neutron number143
relative atomic mass
236,046568296 ± 0,000054129 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
153 ± 5 ky
spin6
nuclear quadrupole moment
ontdekkingsdatum1949
parity-

decay modeintensity
ϵ (electron capture)86.3%
β (β decay)13.5%
α (α emission)0.16%

237Np

Massagetal237
neutron number144
relative atomic mass
237,04817164 ± 0,000001201 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
2,144 ± 0,007 My
spin5/2
nuclear quadrupole moment
3,886 ± 0,006
ontdekkingsdatum1948
parity+

decay modeintensity
α (α emission)100%
SF (spontaneous fission)2%
30Mg4%

238Np

Massagetal238
neutron number145
relative atomic mass
238,050944603 ± 0,00000122 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
2,099 ± 0,002 d
spin2
nuclear quadrupole moment
ontdekkingsdatum1949
parity+

decay modeintensity
β (β decay)100%

239Np

Massagetal239
neutron number146
relative atomic mass
239,052937538 ± 0,000001406 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
2,356 ± 0,003 d
spin5/2
nuclear quadrupole moment
ontdekkingsdatum1940
parity+

decay modeintensity
β (β decay)100%
α (α emission)

240Np

Massagetal240
neutron number147
relative atomic mass
240,056163778 ± 0,000018284 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
61,9 ± 0,2 m
spin5
nuclear quadrupole moment
ontdekkingsdatum1953
parity+

decay modeintensity
β (β decay)100%

241Np

Massagetal241
neutron number148
relative atomic mass
241,058309671 ± 0,00010736 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
13,9 ± 0,2 m
spin5/2
nuclear quadrupole moment
ontdekkingsdatum1959
parity+

decay modeintensity
β (β decay)100%
α (α emission)

242Np

Massagetal242
neutron number149
relative atomic mass
242,061639548 ± 0,000214712 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
2,2 ± 0,2 m
spin1
nuclear quadrupole moment
ontdekkingsdatum1979
parity+

decay modeintensity
β (β decay)100%

243Np

Massagetal243
neutron number150
relative atomic mass
243,064204 ± 0,000034 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
1,85 ± 0,15 m
spin5/2
nuclear quadrupole moment
ontdekkingsdatum1979
parity+

decay modeintensity
β (β decay)100%

244Np

Massagetal244
neutron number151
relative atomic mass
244,067891 ± 0,000107 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
2,29 ± 0,16 m
spin7
nuclear quadrupole moment
ontdekkingsdatum1987
parity-

decay modeintensity
β (β decay)100%

245Np

Massagetal245
neutron number152
relative atomic mass
245,070693 ± 0,000215 Da
g-factor
natural abundance
radioaktiwiteit☢️ radioactive element
Halfleeftyd
spin5/2
nuclear quadrupole moment
ontdekkingsdatum
parity+

decay modeintensity
β (β decay)
Neptunium2

geskiedenis

Ontdek deurE.M. McMillan, P.H. Abelson
ligging van ontdekkingUnited States
ontdekkingsdatum1940
etimologieNamed for the planet Neptune.
uitspraaknep-TOO-ni-em (Engels)

source

Abundance
Abundance in Earth's crust
natural abundance (oseaan)
natural abundance (human body)
0 %
natural abundance (Meteoroïde)
0 %
natural abundance (Son)
0 %
Abundance in Universe
0 %

Nuclear Screening Constants