Neptunium (Np)

grundstof med atomnummer 93

Atomnummer	93
Atommasse	237
mass number	219

Gruppe
Periode	7
Blok	f

proton	93 p⁺
neutron	126 n⁰
elektron	93 e^-

Animated Bohrs atommodel of Np (Neptunium)

Fysisk Egenskab

Atomradius	175 pm 281 pm
molar volume	21,1 cm³/mol
Kovalent Radius	171 pm 136 pm 116 pm 190 pm
Metallic Radius
Ionisk radius	110 pm 101 pm 87 pm 98 pm 75 pm 72 pm 71 pm 117,8 pm
Crystal Radius	124 pm 115 pm 101 pm 112 pm 89 pm 86 pm 85 pm 131,8 pm
Van der Waals-radius	239 pm 252 pm 342,4 pm
massefylde	20,2 g/cm³

Kemisk Egenskab

energi

proton affinity
electron affinity
ioniseringsenergi	6,2655 eV/particle 11,5 eV/particle 19,7 eV/particle 33,8 eV/particle 48 eV/particle 65 eV/particle 92 eV/particle 107 eV/particle 121 eV/particle 136 eV/particle 151 eV/particle 179 eV/particle 196 eV/particle 233 eV/particle 252 eV/particle 355 eV/particle 382 eV/particle 408 eV/particle 438 eV/particle 466 eV/particle 495 eV/particle 535 eV/particle 565 eV/particle 596 eV/particle 626 eV/particle 770 eV/particle 810 eV/particle 850 eV/particle 880 eV/particle 980 eV/particle 1.020 eV/particle 1.130 eV/particle 1.170 eV/particle 1.280 eV/particle 1.360 eV/particle 1.430 eV/particle 1.510 eV/particle 1.590 eV/particle 1.670 eV/particle 1.740 eV/particle 1.820 eV/particle 1.910 eV/particle 1.990 eV/particle 2.070 eV/particle 2.140 eV/particle 2.200 eV/particle 2.310 eV/particle 2.675 eV/particle 2.745 eV/particle 2.817 eV/particle 2.894 eV/particle 2.969 eV/particle 3.041 eV/particle 3.181 eV/particle 3.255 eV/particle 3.338 eV/particle 3.413 eV/particle 3.718 eV/particle 3.792 eV/particle 3.872 eV/particle 3.947 eV/particle 4.353 eV/particle 4.441 eV/particle 4.658 eV/particle 4.744 eV/particle 7.610 eV/particle 7.770 eV/particle 7.950 eV/particle 8.130 eV/particle 8.310 eV/particle 8.480 eV/particle 8.890 eV/particle 9.070 eV/particle 9.270 eV/particle 9.450 eV/particle 9.970 eV/particle 10.130 eV/particle 10.300 eV/particle 10.460 eV/particle 11.740 eV/particle 11.930 eV/particle 12.320 eV/particle 12.500 eV/particle 25.870 eV/particle 26.300 eV/particle 26.770 eV/particle 27.210 eV/particle 31.910 eV/particle 32.500 eV/particle 33.300 eV/particle 33.722,2 eV/particle 132.901,8 eV/particle 135.202 eV/particle

Fordampningsvarme	336 kJ/mol
smeltevarme	9,6 kJ/mol
standard enthalpy of formation	464,8 kJ/mol
elektron

Elektronskal	2, 8, 18, 32, 22, 9, 2

Valenselektron	2 ⓘ

electron configuration	[Rn] 5f⁴ 6d¹ 7s²ⓘ 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 5f⁴ 6d¹ 7s²

Oxidationstrin	2, 3, 4, 5, 6, 7
Elektronegativitet	0.14265 1.3
Electrophilicity Index
fundamental state of matter

stoffase	Fast stof
gaseous state of matter
Kogepunkt
Smeltepunkt	917,15 K
critical pressure
critical temperature
trippelpunkt
appearance
farve	Silver #ffffff #0080ff #0080ff
appearance	silvery metallic
Brydningsindeks
materialeegenskab
Varmeledningsevne
Termisk ekspansion
molar heat capacity
Varmefylde
Adiabateksponenten
electrical properties
type	Conductor
specifik ledningsevne	0,83 MS/m
Elektrisk resistivitet	0,0000012 Ω*m
superledning
Magnetisme
type
magnetic susceptibility (Mass)
magnetic susceptibility (Molar)
magnetic susceptibility (Volume)
magnetic ordering
Curietemperaturen
Néel temperature
struktur
Krystalstruktur	Simpel Orthohombisk (ORC)
lattice constant	4,72 Å
Lattice Angles	π/2, π/2, π/2
mechanical property
hårdhed
Kompressibilitetsmodul
Forskydningsmodul
E-modul
Poissons forhold
speed of sound
klassificering
Kategori	Actinider, Actinides
CAS Group
IUPAC Group
Glawe Number	37
Mendeleev Number	22
Pettifor Number	44
Geochemical Class
Goldschmidt classification	synthetic

øvrige

Gas Basicity
polarizability	151 ± 20 a₀
C6 Dispersion Coefficient
allotrope
Neutron cross section	180
Neutron Mass Absorption
quantum number	6L11/2
rumgruppe	62 (Pnma)

Isotopes of Neptunium

Stable Isotopes	0
Unstable Isotopes	27
Natural Isotopes	0

²¹⁹Np

mass number	219
neutron number	126
Relative Atomic Mass	219,031601865 ± 0,000098732 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	570 ± 450 us
spin	9/2
nuclear quadrupole moment
opdagelsesdato	2015
Paritet	-

decay mode	Intensitet
α (α emission)	100%

²²⁰Np

mass number	220
neutron number	127
Relative Atomic Mass	220,03271628 ± 0,000032977 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	29 ± 11 ns
spin	1
nuclear quadrupole moment
opdagelsesdato	2019
Paritet	-

decay mode	Intensitet
α (α emission)	100%

²²¹Np

mass number	221
neutron number	128
Relative Atomic Mass	221,03211 ± 0,000215 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid
spin	9/2
nuclear quadrupole moment
opdagelsesdato
Paritet	-

decay mode	Intensitet
α (α emission)

²²²Np

mass number	222
neutron number	129
Relative Atomic Mass	222,033574706 ± 0,000040849 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	480 ± 190 ns
spin	1
nuclear quadrupole moment
opdagelsesdato	2020
Paritet	-

decay mode	Intensitet
α (α emission)	100%

²²³Np

mass number	223
neutron number	130
Relative Atomic Mass	223,03291334 ± 0,000088956 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	2,5 ± 0,8 us
spin	9/2
nuclear quadrupole moment
opdagelsesdato	2017
Paritet	-

decay mode	Intensitet
α (α emission)	100%

²²⁴Np

mass number	224
neutron number	131
Relative Atomic Mass	224,03438803 ± 0,000031052 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	48 ± 19 us
spin	2
nuclear quadrupole moment
opdagelsesdato	2018
Paritet	-

decay mode	Intensitet
α (α emission)	100%

²²⁵Np

mass number	225
neutron number	132
Relative Atomic Mass	225,033943422 ± 0,000098355 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	6,5 ± 3,5 ms
spin	9/2
nuclear quadrupole moment
opdagelsesdato	1994
Paritet	-

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

²²⁶Np

mass number	226
neutron number	133
Relative Atomic Mass	226,035230364 ± 0,000109568 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	35 ± 10 ms
spin
nuclear quadrupole moment
opdagelsesdato	1990
Paritet

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

²²⁷Np

mass number	227
neutron number	134
Relative Atomic Mass	227,034975012 ± 0,000082651 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	510 ± 60 ms
spin	5/2
nuclear quadrupole moment
opdagelsesdato	1990
Paritet	+

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

²²⁸Np

mass number	228
neutron number	135
Relative Atomic Mass	228,036313 ± 0,000108 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	61,4 ± 1,4 s
spin	4
nuclear quadrupole moment
opdagelsesdato	1994
Paritet	+

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

²²⁹Np

mass number	229
neutron number	136
Relative Atomic Mass	229,036287269 ± 0,000108618 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	4 ± 0,18 m
spin	5/2
nuclear quadrupole moment
opdagelsesdato	1968
Paritet	+

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

²³⁰Np

mass number	230
neutron number	137
Relative Atomic Mass	230,03782806 ± 0,000059051 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	4,6 ± 0,3 m
spin	4
nuclear quadrupole moment
opdagelsesdato	1968
Paritet	+

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

²³¹Np

mass number	231
neutron number	138
Relative Atomic Mass	231,038243598 ± 0,000054916 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	48,8 ± 0,2 m
spin	5/2
nuclear quadrupole moment
opdagelsesdato	1950
Paritet	+

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

²³²Np

mass number	232
neutron number	139
Relative Atomic Mass	232,040107 ± 0,000107 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	14,7 ± 0,3 m
spin	5
nuclear quadrupole moment
opdagelsesdato	1950
Paritet	-

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

²³³Np

mass number	233
neutron number	140
Relative Atomic Mass	233,040739421 ± 0,000054729 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	36,2 ± 0,1 m
spin	5/2
nuclear quadrupole moment
opdagelsesdato	1950
Paritet	+

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

²³⁴Np

mass number	234
neutron number	141
Relative Atomic Mass	234,042893245 ± 0,000009014 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	4,4 ± 0,1 d
spin	0
nuclear quadrupole moment	0
opdagelsesdato	1949
Paritet	+

decay mode	Intensitet
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	100%

²³⁵Np

mass number	235
neutron number	142
Relative Atomic Mass	235,044061518 ± 0,00000149 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	396,1 ± 1,2 d
spin	5/2
nuclear quadrupole moment
opdagelsesdato	1949
Paritet	+

decay mode	Intensitet
ϵ (electron capture)	99.9974%
α (α emission)	0.0026%

²³⁶Np

mass number	236
neutron number	143
Relative Atomic Mass	236,046568296 ± 0,000054129 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	153 ± 5 ky
spin	6
nuclear quadrupole moment
opdagelsesdato	1949
Paritet	-

decay mode	Intensitet
ϵ (electron capture)	86.3%
β⁻ (β⁻ decay)	13.5%
α (α emission)	0.16%

²³⁷Np

mass number	237
neutron number	144
Relative Atomic Mass	237,04817164 ± 0,000001201 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	2,144 ± 0,007 My
spin	5/2
nuclear quadrupole moment	3,886 ± 0,006
opdagelsesdato	1948
Paritet	+

decay mode	Intensitet
α (α emission)	100%
SF (spontaneous fission)	2%
30Mg	4%

²³⁸Np

mass number	238
neutron number	145
Relative Atomic Mass	238,050944603 ± 0,00000122 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	2,099 ± 0,002 d
spin	2
nuclear quadrupole moment
opdagelsesdato	1949
Paritet	+

decay mode	Intensitet
β⁻ (β⁻ decay)	100%

²³⁹Np

mass number	239
neutron number	146
Relative Atomic Mass	239,052937538 ± 0,000001406 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	2,356 ± 0,003 d
spin	5/2
nuclear quadrupole moment
opdagelsesdato	1940
Paritet	+

decay mode	Intensitet
β⁻ (β⁻ decay)	100%
α (α emission)

²⁴⁰Np

mass number	240
neutron number	147
Relative Atomic Mass	240,056163778 ± 0,000018284 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	61,9 ± 0,2 m
spin	5
nuclear quadrupole moment
opdagelsesdato	1953
Paritet	+

decay mode	Intensitet
β⁻ (β⁻ decay)	100%

²⁴¹Np

mass number	241
neutron number	148
Relative Atomic Mass	241,058309671 ± 0,00010736 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	13,9 ± 0,2 m
spin	5/2
nuclear quadrupole moment
opdagelsesdato	1959
Paritet	+

decay mode	Intensitet
β⁻ (β⁻ decay)	100%
α (α emission)

²⁴²Np

mass number	242
neutron number	149
Relative Atomic Mass	242,061639548 ± 0,000214712 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	2,2 ± 0,2 m
spin	1
nuclear quadrupole moment
opdagelsesdato	1979
Paritet	+

decay mode	Intensitet
β⁻ (β⁻ decay)	100%

²⁴³Np

mass number	243
neutron number	150
Relative Atomic Mass	243,064204 ± 0,000034 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	1,85 ± 0,15 m
spin	5/2
nuclear quadrupole moment
opdagelsesdato	1979
Paritet	+

decay mode	Intensitet
β⁻ (β⁻ decay)	100%

²⁴⁴Np

mass number	244
neutron number	151
Relative Atomic Mass	244,067891 ± 0,000107 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	2,29 ± 0,16 m
spin	7
nuclear quadrupole moment
opdagelsesdato	1987
Paritet	-

decay mode	Intensitet
β⁻ (β⁻ decay)	100%

²⁴⁵Np

mass number	245
neutron number	152
Relative Atomic Mass	245,070693 ± 0,000215 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid
spin	5/2
nuclear quadrupole moment
opdagelsesdato
Paritet	+

decay mode	Intensitet
β⁻ (β⁻ decay)

historie

opdager eller opfinder	E.M. McMillan, P.H. Abelson
fundsted	United States
opdagelsesdato	1940
etymologi	Named for the planet Neptune.
udtale	nep-TOO-ni-em (engelsk)

source

Forekomst
Abundance in Earth's crust
natural abundance (verdenshave)
natural abundance (menneskelige krop)	0 %
natural abundance (Meteoroid)	0 %
natural abundance (Solen)	0 %
Abundance in Universe	0 %

Nuclear Screening Constants

Neptunium on ChemicalAid

Neptunium (Np)

Fysisk Egenskab

Kemisk Egenskab

øvrige

Isotopes of Neptunium

219Np

220Np

221Np

222Np

223Np

224Np

225Np

226Np

227Np

228Np

229Np

230Np

231Np

232Np

233Np

234Np

235Np

236Np

237Np

238Np

239Np

240Np

241Np

242Np

243Np

244Np

245Np

historie

source

Nuclear Screening Constants

²¹⁹Np

²²⁰Np

²²¹Np

²²²Np

²²³Np

²²⁴Np

²²⁵Np

²²⁶Np

²²⁷Np

²²⁸Np

²²⁹Np

²³⁰Np

²³¹Np

²³²Np

²³³Np

²³⁴Np

²³⁵Np

²³⁶Np

²³⁷Np

²³⁸Np

²³⁹Np

²⁴⁰Np

²⁴¹Np

²⁴²Np

²⁴³Np

²⁴⁴Np

²⁴⁵Np