Califòrni

Califòrni (Cf)

chemical element with the atomic number of 98
Atomic Number98
Atomic Weight251
mass number237
Group
Period7
Blockf
proton98 p+
neutron139 n0
electron98 e-
Animated Bohr model of Cf (Califòrni)

Proprietat Fisica

Rai Atomic
molar volume
covalent radius
168 pm
Metallic Radius
ionic radius
95 pm
Crystal Radius
109 pm
Rai de van der Waals
245 pm
densitat
15.1 g/cm³

Chemical Property

energia
proton affinity
electron affinity
ionization energy
ionization energy of Cf (Califòrni)
enthalpy of vaporization
enthalpy of fusion
standard enthalpy of formation
196 kJ/mol
electron
electron shell2, 8, 18, 32, 28, 8, 2
Bohr model: Cf (Califòrni)
valence electron2
Lewis structure: Cf (Califòrni)
electron configuration[Rn] 5f10 7s2
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 5f10 7s2
Enhanced Bohr model of Cf (Califòrni)
Orbital Diagram of Cf (Califòrni)
oxidation number2, 3, 4, 5
Electronegativitat
Electrophilicity Index
fundamental state of matter
estat de la matèriaSolid
gaseous state of matter
Boiling Point
Melting Point
1173.15 K
critical pressure
critical temperature
Ponch triple
appearance
Color
Colorless
appearancesilvery
Indici de refraccion
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
estructura
Crystal StructureSimple Hexagonal ()
lattice constant
Lattice Anglesπ/2, π/2, 2 π/3
mechanical property
Duretat
bulk modulus
shear modulus
Young's modulus
Poisson's ratio
speed of sound
classification
CategoryActinides, Actinides
CAS Group
IUPAC Group
Glawe Number42
Mendeleev Number32
Pettifor Number39
Geochemical Class
Goldschmidt classificationsynthetic

other

Gas Basicity
polarizability
122 ± 20 a₀
C6 Dispersion Coefficient
allotrope
Neutron cross section
2900
Neutron Mass Absorption
quantum number5I8
space group194 (P63/mmc)

Isotopes of Californium

Stable Isotopes0
Unstable Isotopes20
Natural Isotopes0

237Cf

mass number237
neutron number139
relative atomic mass
237.062199272 ± 0.000104506 Da
g-factor
natural abundance
Radioactivitat☢️ radioactive element
Semivida
0.8 ± 0.2 s
Espin5/2
nuclear quadrupole moment
data de descobèrta1995
parity+

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

238Cf

mass number238
neutron number140
relative atomic mass
238.06149 ± 0.00032 Da
g-factor
0
natural abundance
Radioactivitat☢️ radioactive element
Semivida
21.1 ± 1.3 ms
Espin0
nuclear quadrupole moment
0
data de descobèrta1995
parity+

decay modeintensity
SF (spontaneous fission)97.5%
α (α emission)2.5%

239Cf

mass number239
neutron number141
relative atomic mass
239.062482 ± 0.000129 Da
g-factor
natural abundance
Radioactivitat☢️ radioactive element
Semivida
28 ± 2 s
Espin5/2
nuclear quadrupole moment
data de descobèrta1981
parity+

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

240Cf

mass number240
neutron number142
relative atomic mass
240.062253447 ± 0.00001936 Da
g-factor
0
natural abundance
Radioactivitat☢️ radioactive element
Semivida
40.3 ± 0.9 s
Espin0
nuclear quadrupole moment
0
data de descobèrta1970
parity+

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

241Cf

mass number241
neutron number143
relative atomic mass
241.06369 ± 0.00018 Da
g-factor
natural abundance
Radioactivitat☢️ radioactive element
Semivida
2.35 ± 0.18 m
Espin7/2
nuclear quadrupole moment
data de descobèrta1970
parity-

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

242Cf

mass number242
neutron number144
relative atomic mass
242.063754544 ± 0.00001384 Da
g-factor
0
natural abundance
Radioactivitat☢️ radioactive element
Semivida
3.49 ± 0.15 m
Espin0
nuclear quadrupole moment
0
data de descobèrta1967
parity+

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

243Cf

mass number243
neutron number145
relative atomic mass
243.065475 ± 0.000194 Da
g-factor
natural abundance
Radioactivitat☢️ radioactive element
Semivida
10.8 ± 0.3 m
Espin1/2
nuclear quadrupole moment
0
data de descobèrta1967
parity+

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

244Cf

mass number244
neutron number146
relative atomic mass
244.065999447 ± 0.000002809 Da
g-factor
0
natural abundance
Radioactivitat☢️ radioactive element
Semivida
19.5 ± 0.5 m
Espin0
nuclear quadrupole moment
0
data de descobèrta1956
parity+

decay modeintensity
α (α emission)75%
ϵ (electron capture)25%

245Cf

mass number245
neutron number147
relative atomic mass
245.068046755 ± 0.000002606 Da
g-factor
natural abundance
Radioactivitat☢️ radioactive element
Semivida
45 ± 1.5 m
Espin1/2
nuclear quadrupole moment
0
data de descobèrta1956
parity+

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

246Cf

mass number246
neutron number148
relative atomic mass
246.068803685 ± 0.000001625 Da
g-factor
0
natural abundance
Radioactivitat☢️ radioactive element
Semivida
35.7 ± 0.5 h
Espin0
nuclear quadrupole moment
0
data de descobèrta1951
parity+

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

247Cf

mass number247
neutron number149
relative atomic mass
247.070971348 ± 0.00001538 Da
g-factor
natural abundance
Radioactivitat☢️ radioactive element
Semivida
3.11 ± 0.03 h
Espin7/2
nuclear quadrupole moment
data de descobèrta1954
parity+

decay modeintensity
ϵ (electron capture)99.965%
α (α emission)0.035%

248Cf

mass number248
neutron number150
relative atomic mass
248.072182905 ± 0.000005497 Da
g-factor
0
natural abundance
Radioactivitat☢️ radioactive element
Semivida
333.5 ± 2.8 d
Espin0
nuclear quadrupole moment
0
data de descobèrta1954
parity+

decay modeintensity
α (α emission)100%
SF (spontaneous fission)0.0029%

249Cf

mass number249
neutron number151
relative atomic mass
249.074850428 ± 0.000001269 Da
g-factor
natural abundance
Radioactivitat☢️ radioactive element
Semivida
351 ± 2 y
Espin9/2
nuclear quadrupole moment
data de descobèrta1954
parity-

decay modeintensity
α (α emission)100%
SF (spontaneous fission)5%

250Cf

mass number250
neutron number152
relative atomic mass
250.076404494 ± 0.00000165 Da
g-factor
0
natural abundance
Radioactivitat☢️ radioactive element
Semivida
13.08 ± 0.09 y
Espin0
nuclear quadrupole moment
0
data de descobèrta1954
parity+

decay modeintensity
α (α emission)99.923%
SF (spontaneous fission)0.077%

251Cf

mass number251
neutron number153
relative atomic mass
251.079587171 ± 0.000004187 Da
g-factor
natural abundance
Radioactivitat☢️ radioactive element
Semivida
898 ± 44 y
Espin1/2
nuclear quadrupole moment
0
data de descobèrta1954
parity+

decay modeintensity
α (α emission)100%
SF (spontaneous fission)

252Cf

mass number252
neutron number154
relative atomic mass
252.081626507 ± 0.000002531 Da
g-factor
0
natural abundance
Radioactivitat☢️ radioactive element
Semivida
2.645 ± 0.008 y
Espin0
nuclear quadrupole moment
0
data de descobèrta1954
parity+

decay modeintensity
α (α emission)96.8972%
SF (spontaneous fission)3.1028%

253Cf

mass number253
neutron number155
relative atomic mass
253.085133723 ± 0.00000457 Da
g-factor
natural abundance
Radioactivitat☢️ radioactive element
Semivida
17.81 ± 0.08 d
Espin7/2
nuclear quadrupole moment
data de descobèrta1954
parity+

decay modeintensity
β (β decay)99.69%
α (α emission)0.31%

254Cf

mass number254
neutron number156
relative atomic mass
254.087323575 ± 0.000012304 Da
g-factor
0
natural abundance
Radioactivitat☢️ radioactive element
Semivida
60.5 ± 0.2 d
Espin0
nuclear quadrupole moment
0
data de descobèrta1955
parity+

decay modeintensity
SF (spontaneous fission)99.69%
α (α emission)0.31%
(double β decay)

255Cf

mass number255
neutron number157
relative atomic mass
255.091046 ± 0.000215 Da
g-factor
natural abundance
Radioactivitat☢️ radioactive element
Semivida
85 ± 18 m
Espin7/2
nuclear quadrupole moment
data de descobèrta1981
parity+

decay modeintensity
β (β decay)100%
SF (spontaneous fission)
α (α emission)

256Cf

mass number256
neutron number158
relative atomic mass
256.093442 ± 0.000338 Da
g-factor
0
natural abundance
Radioactivitat☢️ radioactive element
Semivida
12.3 ± 1.2 m
Espin0
nuclear quadrupole moment
0
data de descobèrta1980
parity+

decay modeintensity
SF (spontaneous fission)100%
α (α emission)
(double β decay)
Californium

istòria

descobridor o inventaireG.T.Seaborg, S.G.Tompson, A.Ghiorso, K.Street Jr.
luòc de descobèrtaUnited States
data de descobèrta1950
EtimologiaNamed after the state and University of California.
pronunciationkal-eh-FOR-ni-em (English)

source

Abundance
Abundance in Earth's crust
natural abundance (Ocean)
natural abundance (còs uman)
0 %
natural abundance (meteoroid)
0 %
natural abundance (Solelh)
0 %
Abundance in Universe
0 %

Nuclear Screening Constants