Californium (Cf)

grundstof med atomnummer 98

Atomnummer	98
Atommasse	251
mass number	237

Gruppe
Periode	7
Blok	f

proton	98 p⁺
neutron	139 n⁰
elektron	98 e^-

Animated Bohrs atommodel of Cf (Californium)

Fysisk Egenskab

Atomradius
molar volume
Kovalent Radius	168 pm 140 pm
Metallic Radius
Ionisk radius	95 pm 82,1 pm 92 pm 112,6 pm
Crystal Radius	109 pm 96,1 pm 106 pm 126,6 pm
Van der Waals-radius	245 pm 331,3 pm
massefylde	15,1 g/cm³

Kemisk Egenskab

{ERROR}

energi

proton affinity
electron affinity
ioniseringsenergi	6,2817 eV/particle 12 eV/particle 22,4 eV/particle 37,7 eV/particle 51,9 eV/particle 75 eV/particle 91 eV/particle 112,9 eV/particle 133 eV/particle 152 eV/particle 178 eV/particle 202 eV/particle 225 eV/particle 247 eV/particle 265 eV/particle 286 eV/particle 310 eV/particle 334 eV/particle 368 eV/particle 390 eV/particle 536 eV/particle 566 eV/particle 597 eV/particle 630 eV/particle 662 eV/particle 695 eV/particle 744 eV/particle 778 eV/particle 814 eV/particle 847 eV/particle 1.010 eV/particle 1.050 eV/particle 1.090 eV/particle 1.120 eV/particle 1.250 eV/particle 1.300 eV/particle 1.420 eV/particle 1.460 eV/particle 1.620 eV/particle 1.700 eV/particle 1.790 eV/particle 1.880 eV/particle 1.960 eV/particle 2.050 eV/particle 2.130 eV/particle 2.220 eV/particle 2.320 eV/particle 2.410 eV/particle 2.490 eV/particle 2.580 eV/particle 2.670 eV/particle 2.750 eV/particle 3.186 eV/particle 3.261 eV/particle 3.340 eV/particle 3.424 eV/particle 3.503 eV/particle 3.581 eV/particle 3.747 eV/particle 3.828 eV/particle 3.915 eV/particle 3.998 eV/particle 4.329 eV/particle 4.407 eV/particle 4.494 eV/particle 4.570 eV/particle 5.100 eV/particle 5.190 eV/particle 5.430 eV/particle 5.520 eV/particle 8.730 eV/particle 8.900 eV/particle 9.090 eV/particle 9.290 eV/particle 9.480 eV/particle 9.660 eV/particle 10.140 eV/particle 10.330 eV/particle 10.550 eV/particle 10.740 eV/particle 11.300 eV/particle 11.470 eV/particle 11.650 eV/particle 11.820 eV/particle 13.450 eV/particle 13.660 eV/particle 14.080 eV/particle 14.280 eV/particle 29.000 eV/particle 29.500 eV/particle 30.000 eV/particle 30.500 eV/particle 36.500 eV/particle 37.100 eV/particle 37.900 eV/particle 38.443,5 eV/particle 150.579,3 eV/particle 153.124 eV/particle

Fordampningsvarme
smeltevarme
standard enthalpy of formation	196 kJ/mol
elektron

Elektronskal	2, 8, 18, 32, 28, 8, 2

Valenselektron	2 ⓘ

electron configuration	[Rn] 5f¹⁰ 7s²ⓘ 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 5f¹⁰ 7s²

Oxidationstrin	2, 3, 4, 5
Elektronegativitet	0.20369
Electrophilicity Index
fundamental state of matter

stoffase
gaseous state of matter
Kogepunkt
Smeltepunkt	1.173,15 K
critical pressure
critical temperature
trippelpunkt
appearance
farve	Sort #ffffff #a136d4 #a136d4
appearance	silvery
Brydningsindeks
materialeegenskab
Varmeledningsevne
Termisk ekspansion
molar heat capacity
Varmefylde
Adiabateksponenten
electrical properties
type
specifik ledningsevne
Elektrisk resistivitet
superledning
Magnetisme
type
magnetic susceptibility (Mass)
magnetic susceptibility (Molar)
magnetic susceptibility (Volume)
magnetic ordering
Curietemperaturen
Néel temperature
struktur
Krystalstruktur	{ERROR}
lattice constant
Lattice Angles	π/2, π/2, 2 π/3
mechanical property
hårdhed
Kompressibilitetsmodul
Forskydningsmodul
E-modul
Poissons forhold
speed of sound
klassificering
Kategori	Actinider, Actinides
CAS Group
IUPAC Group
Glawe Number	42
Mendeleev Number	32
Pettifor Number	39
Geochemical Class
Goldschmidt classification	synthetic

øvrige

Gas Basicity
polarizability	122 ± 20 a₀
C6 Dispersion Coefficient
allotrope
Neutron cross section	2.900
Neutron Mass Absorption
quantum number	5I8
rumgruppe	194 (P63/mmc)

Isotopes of Californium

Stable Isotopes	0
Unstable Isotopes	20
Natural Isotopes	0

²³⁷Cf

mass number	237
neutron number	139
Relative Atomic Mass	237,062199272 ± 0,000104506 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	0,8 ± 0,2 s
spin	5/2
nuclear quadrupole moment
opdagelsesdato	1995
Paritet	+

decay mode	Intensitet
α (α emission)	70%
SF (spontaneous fission)	30%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)

²³⁸Cf

mass number	238
neutron number	140
Relative Atomic Mass	238,06149 ± 0,00032 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	21,1 ± 1,3 ms
spin	0
nuclear quadrupole moment	0
opdagelsesdato	1995
Paritet	+

decay mode	Intensitet
SF (spontaneous fission)	97.5%
α (α emission)	2.5%

²³⁹Cf

mass number	239
neutron number	141
Relative Atomic Mass	239,062482 ± 0,000129 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	28 ± 2 s
spin	5/2
nuclear quadrupole moment
opdagelsesdato	1981
Paritet	+

decay mode	Intensitet
α (α emission)	65%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)

²⁴⁰Cf

mass number	240
neutron number	142
Relative Atomic Mass	240,062253447 ± 0,00001936 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	40,3 ± 0,9 s
spin	0
nuclear quadrupole moment	0
opdagelsesdato	1970
Paritet	+

decay mode	Intensitet
α (α emission)	98.5%
SF (spontaneous fission)	1.5%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)

²⁴¹Cf

mass number	241
neutron number	143
Relative Atomic Mass	241,06369 ± 0,00018 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	2,35 ± 0,18 m
spin	7/2
nuclear quadrupole moment
opdagelsesdato	1970
Paritet	-

decay mode	Intensitet
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)
α (α emission)	15%

²⁴²Cf

mass number	242
neutron number	144
Relative Atomic Mass	242,063754544 ± 0,00001384 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	3,49 ± 0,15 m
spin	0
nuclear quadrupole moment	0
opdagelsesdato	1967
Paritet	+

decay mode	Intensitet
α (α emission)	61%
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	39%
SF (spontaneous fission)	0.014%

²⁴³Cf

mass number	243
neutron number	145
Relative Atomic Mass	243,065475 ± 0,000194 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	10,8 ± 0,3 m
spin	1/2
nuclear quadrupole moment	0
opdagelsesdato	1967
Paritet	+

decay mode	Intensitet
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	86%
α (α emission)	14%

²⁴⁴Cf

mass number	244
neutron number	146
Relative Atomic Mass	244,065999447 ± 0,000002809 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	19,5 ± 0,5 m
spin	0
nuclear quadrupole moment	0
opdagelsesdato	1956
Paritet	+

decay mode	Intensitet
α (α emission)	75%
ϵ (electron capture)	25%

²⁴⁵Cf

mass number	245
neutron number	147
Relative Atomic Mass	245,068046755 ± 0,000002606 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	45 ± 1,5 m
spin	1/2
nuclear quadrupole moment	0
opdagelsesdato	1956
Paritet	+

decay mode	Intensitet
β⁺ (β⁺ decay; β⁺ = ϵ + e⁺)	64.7%
α (α emission)	35.3%

²⁴⁶Cf

mass number	246
neutron number	148
Relative Atomic Mass	246,068803685 ± 0,000001625 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	35,7 ± 0,5 h
spin	0
nuclear quadrupole moment	0
opdagelsesdato	1951
Paritet	+

decay mode	Intensitet
α (α emission)	100%
SF (spontaneous fission)	2.4%
ϵ (electron capture)

²⁴⁷Cf

mass number	247
neutron number	149
Relative Atomic Mass	247,070971348 ± 0,00001538 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	3,11 ± 0,03 h
spin	7/2
nuclear quadrupole moment
opdagelsesdato	1954
Paritet	+

decay mode	Intensitet
ϵ (electron capture)	99.965%
α (α emission)	0.035%

²⁴⁸Cf

mass number	248
neutron number	150
Relative Atomic Mass	248,072182905 ± 0,000005497 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	333,5 ± 2,8 d
spin	0
nuclear quadrupole moment	0
opdagelsesdato	1954
Paritet	+

decay mode	Intensitet
α (α emission)	100%
SF (spontaneous fission)	0.0029%

²⁴⁹Cf

mass number	249
neutron number	151
Relative Atomic Mass	249,074850428 ± 0,000001269 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	351 ± 2 y
spin	9/2
nuclear quadrupole moment
opdagelsesdato	1954
Paritet	-

decay mode	Intensitet
α (α emission)	100%
SF (spontaneous fission)	5%

²⁵⁰Cf

mass number	250
neutron number	152
Relative Atomic Mass	250,076404494 ± 0,00000165 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	13,08 ± 0,09 y
spin	0
nuclear quadrupole moment	0
opdagelsesdato	1954
Paritet	+

decay mode	Intensitet
α (α emission)	99.923%
SF (spontaneous fission)	0.077%

²⁵¹Cf

mass number	251
neutron number	153
Relative Atomic Mass	251,079587171 ± 0,000004187 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	898 ± 44 y
spin	1/2
nuclear quadrupole moment	0
opdagelsesdato	1954
Paritet	+

decay mode	Intensitet
α (α emission)	100%
SF (spontaneous fission)

²⁵²Cf

mass number	252
neutron number	154
Relative Atomic Mass	252,081626507 ± 0,000002531 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	2,645 ± 0,008 y
spin	0
nuclear quadrupole moment	0
opdagelsesdato	1954
Paritet	+

decay mode	Intensitet
α (α emission)	96.8972%
SF (spontaneous fission)	3.1028%

²⁵³Cf

mass number	253
neutron number	155
Relative Atomic Mass	253,085133723 ± 0,00000457 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	17,81 ± 0,08 d
spin	7/2
nuclear quadrupole moment
opdagelsesdato	1954
Paritet	+

decay mode	Intensitet
β⁻ (β⁻ decay)	99.69%
α (α emission)	0.31%

²⁵⁴Cf

mass number	254
neutron number	156
Relative Atomic Mass	254,087323575 ± 0,000012304 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	60,5 ± 0,2 d
spin	0
nuclear quadrupole moment	0
opdagelsesdato	1955
Paritet	+

decay mode	Intensitet
SF (spontaneous fission)	99.69%
α (α emission)	0.31%
2β⁻ (double β⁻ decay)

²⁵⁵Cf

mass number	255
neutron number	157
Relative Atomic Mass	255,091046 ± 0,000215 Da
g-factor
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	85 ± 18 m
spin	7/2
nuclear quadrupole moment
opdagelsesdato	1981
Paritet	+

decay mode	Intensitet
β⁻ (β⁻ decay)	100%
SF (spontaneous fission)
α (α emission)

²⁵⁶Cf

mass number	256
neutron number	158
Relative Atomic Mass	256,093442 ± 0,000338 Da
g-factor	0
natural abundance
radioaktivitet	☢️ radioactive element
halveringstid	12,3 ± 1,2 m
spin	0
nuclear quadrupole moment	0
opdagelsesdato	1980
Paritet	+

decay mode	Intensitet
SF (spontaneous fission)	100%
α (α emission)
2β⁻ (double β⁻ decay)

historie

opdager eller opfinder	G.T.Seaborg, S.G.Tompson, A.Ghiorso, K.Street Jr.
fundsted	United States
opdagelsesdato	1950
etymologi	Named after the state and University of California.
udtale	kal-eh-FOR-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

Californium on ChemicalAid

Californium (Cf)

Fysisk Egenskab

Kemisk Egenskab

øvrige

Isotopes of Californium

237Cf

238Cf

239Cf

240Cf

241Cf

242Cf

243Cf

244Cf

245Cf

246Cf

247Cf

248Cf

249Cf

250Cf

251Cf

252Cf

253Cf

254Cf

255Cf

256Cf

historie

source

Nuclear Screening Constants

²³⁷Cf

²³⁸Cf

²³⁹Cf

²⁴⁰Cf

²⁴¹Cf

²⁴²Cf

²⁴³Cf

²⁴⁴Cf

²⁴⁵Cf

²⁴⁶Cf

²⁴⁷Cf

²⁴⁸Cf

²⁴⁹Cf

²⁵⁰Cf

²⁵¹Cf

²⁵²Cf

²⁵³Cf

²⁵⁴Cf

²⁵⁵Cf

²⁵⁶Cf