Calyfornyum (Cf)

chemical element with the atomic number of 98

Atomic Number	98
Atomic Weight	251
mass number	237

Group
Period	7
Block	f

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

Physical Property

Atomic Radius
molar volume
covalent radius	168 pm 140 pm
Metallic Radius
ionic 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
dosedh	15.1 g/cm³

Chemical Property

nerth

proton affinity
electron affinity
ionization energy	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

enthalpy of vaporization
enthalpy of fusion
standard enthalpy of formation	196 kJ/mol
electron

electron shell	2, 8, 18, 32, 28, 8, 2

valence electron	2 ⓘ

aray an elektrons	[Rn] 5f¹⁰ 7s²ⓘ 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 5f¹⁰ 7s²

oxidation number	2, 3, 4, 5
electronegativity	0.20369
Electrophilicity Index
fundamental state of matter

phase of matter	Solid
gaseous state of matter
Boiling Point
Melting Point	1,173.15 K
critical pressure
critical temperature
triple point
appearance
liw	Colorless #ffffff #a136d4 #a136d4
appearance	silvery
refractive index
thermodynamic material property
Thermal Conductivity
thermal expansion
molar heat capacity
Specific Heat Capacity
heat capacity ratio
electrical properties
type
electrical conductivity
electrical resistivity
superconductivity
magnetism
type
magnetic susceptibility (Mass)
magnetic susceptibility (Molar)
magnetic susceptibility (Volume)
magnetic ordering
Curie temperature
Néel temperature
kesweyth
Crystal Structure	Simple Hexagonal ()
lattice constant
Lattice Angles	π/2, π/2, 2 π/3
mechanical property
hardness
bulk modulus
shear modulus
Young's modulus
Poisson's ratio
speed of sound
classification
Category	Actinides, Actinides
CAS Group
IUPAC Group
Glawe Number	42
Mendeleev Number	32
Pettifor Number	39
Geochemical Class
Goldschmidt classification	synthetic

other

Gas Basicity
polarizability	122 ± 20 a₀
C6 Dispersion Coefficient
allotrope
Neutron cross section	2,900
Neutron Mass Absorption
quantum number	5I8
space group	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
radioactivity	☢️ elven radyoweythresek
half-life	0.8 ± 0.2 s
spin	5/2
nuclear quadrupole moment
dydhyas diskudhans	1995
parity	+

decay mode	intensity
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
radioactivity	☢️ elven radyoweythresek
half-life	21.1 ± 1.3 ms
spin	0
nuclear quadrupole moment	0
dydhyas diskudhans	1995
parity	+

decay mode	intensity
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
radioactivity	☢️ elven radyoweythresek
half-life	28 ± 2 s
spin	5/2
nuclear quadrupole moment
dydhyas diskudhans	1981
parity	+

decay mode	intensity
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
radioactivity	☢️ elven radyoweythresek
half-life	40.3 ± 0.9 s
spin	0
nuclear quadrupole moment	0
dydhyas diskudhans	1970
parity	+

decay mode	intensity
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
radioactivity	☢️ elven radyoweythresek
half-life	2.35 ± 0.18 m
spin	7/2
nuclear quadrupole moment
dydhyas diskudhans	1970
parity	-

decay mode	intensity
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
radioactivity	☢️ elven radyoweythresek
half-life	3.49 ± 0.15 m
spin	0
nuclear quadrupole moment	0
dydhyas diskudhans	1967
parity	+

decay mode	intensity
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
radioactivity	☢️ elven radyoweythresek
half-life	10.8 ± 0.3 m
spin	1/2
nuclear quadrupole moment	0
dydhyas diskudhans	1967
parity	+

decay mode	intensity
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
radioactivity	☢️ elven radyoweythresek
half-life	19.5 ± 0.5 m
spin	0
nuclear quadrupole moment	0
dydhyas diskudhans	1956
parity	+

decay mode	intensity
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
radioactivity	☢️ elven radyoweythresek
half-life	45 ± 1.5 m
spin	1/2
nuclear quadrupole moment	0
dydhyas diskudhans	1956
parity	+

decay mode	intensity
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
radioactivity	☢️ elven radyoweythresek
half-life	35.7 ± 0.5 h
spin	0
nuclear quadrupole moment	0
dydhyas diskudhans	1951
parity	+

decay mode	intensity
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
radioactivity	☢️ elven radyoweythresek
half-life	3.11 ± 0.03 h
spin	7/2
nuclear quadrupole moment
dydhyas diskudhans	1954
parity	+

decay mode	intensity
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
radioactivity	☢️ elven radyoweythresek
half-life	333.5 ± 2.8 d
spin	0
nuclear quadrupole moment	0
dydhyas diskudhans	1954
parity	+

decay mode	intensity
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
radioactivity	☢️ elven radyoweythresek
half-life	351 ± 2 y
spin	9/2
nuclear quadrupole moment
dydhyas diskudhans	1954
parity	-

decay mode	intensity
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
radioactivity	☢️ elven radyoweythresek
half-life	13.08 ± 0.09 y
spin	0
nuclear quadrupole moment	0
dydhyas diskudhans	1954
parity	+

decay mode	intensity
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
radioactivity	☢️ elven radyoweythresek
half-life	898 ± 44 y
spin	1/2
nuclear quadrupole moment	0
dydhyas diskudhans	1954
parity	+

decay mode	intensity
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
radioactivity	☢️ elven radyoweythresek
half-life	2.645 ± 0.008 y
spin	0
nuclear quadrupole moment	0
dydhyas diskudhans	1954
parity	+

decay mode	intensity
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
radioactivity	☢️ elven radyoweythresek
half-life	17.81 ± 0.08 d
spin	7/2
nuclear quadrupole moment
dydhyas diskudhans	1954
parity	+

decay mode	intensity
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
radioactivity	☢️ elven radyoweythresek
half-life	60.5 ± 0.2 d
spin	0
nuclear quadrupole moment	0
dydhyas diskudhans	1955
parity	+

decay mode	intensity
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
radioactivity	☢️ elven radyoweythresek
half-life	85 ± 18 m
spin	7/2
nuclear quadrupole moment
dydhyas diskudhans	1981
parity	+

decay mode	intensity
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
radioactivity	☢️ elven radyoweythresek
half-life	12.3 ± 1.2 m
spin	0
nuclear quadrupole moment	0
dydhyas diskudhans	1980
parity	+

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

istori

diskudher po dismyger	G.T.Seaborg, S.G.Tompson, A.Ghiorso, K.Street Jr.
location of discovery	United States
dydhyas diskudhans	1950
Etymologyl	Named after the state and University of California.
pronunciation	kal-eh-FOR-ni-em (en)

source

Abundance
Abundance in Earth's crust
natural abundance (Keynvor)
natural abundance (Korf)	0 %
natural abundance (meteoroid)	0 %
natural abundance (Howl)	0 %
Abundance in Universe	0 %

Nuclear Screening Constants

Calyfornyum on ChemicalAid

Art & Architecture Thesaurus ID	300380331
Australian Educational Vocabulary ID	scot/3074
CAS Registry Number	7440-71-3
ChEBI ID	33392
ChemSpider ID	22433
DSSTOX compound identifier	DTXCID00147883
DSSTox substance ID	DTXSID00225392
Den Store Danske ID	californium
Encyclopædia Britannica Online ID	science/californium
Encyclopædia Universalis ID	californium
Freebase ID	/m/025tkv8
French Vikidia ID	Californium
Gran Enciclopèdia Catalana ID	0087352
Gran Enciclopèdia Catalana ID	0017254
Great Russian Encyclopedia Online ID	2036031
InChI	InChI=1S/Cf
InChIKey	HGLDOAKPQXAFKI-UHFFFAOYSA-N
KBpedia ID	Californium
Library of Congress authority ID	sh89004338
MeSH descriptor ID	D002142
NALT ID	3198
NDL Authority ID	00565048
National Library of Israel J9U ID	987007553750405171
OmegaWiki Defined Meaning	156905
OpenAlex ID	C547234621
PubChem CID	23997
Römpp online ID	RD-03-00207
Store norske leksikon ID	californium
Treccani ID	californio
UNII	975X05H15A
USGS Thesaurus ID	1419
WordNet 3.1 Synset ID	14657215-n
honanieth GND	4147208-1

Calyfornyum (Cf)

Physical Property

Chemical Property

other

Isotopes of Californium

237Cf

238Cf

239Cf

240Cf

241Cf

242Cf

243Cf

244Cf

245Cf

246Cf

247Cf

248Cf

249Cf

250Cf

251Cf

252Cf

253Cf

254Cf

255Cf

256Cf

istori

source

Nuclear Screening Constants

²³⁷Cf

²³⁸Cf

²³⁹Cf

²⁴⁰Cf

²⁴¹Cf

²⁴²Cf

²⁴³Cf

²⁴⁴Cf

²⁴⁵Cf

²⁴⁶Cf

²⁴⁷Cf

²⁴⁸Cf

²⁴⁹Cf

²⁵⁰Cf

²⁵¹Cf

²⁵²Cf

²⁵³Cf

²⁵⁴Cf

²⁵⁵Cf

²⁵⁶Cf