Kaliforniamo (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 | |
| Metallic Radius | |
| ionic radius | |
| Crystal Radius | |
| Van der Waals radius | |
| density |
Chemical Property
| energy | |
|---|---|
| proton affinity | |
| electron affinity | |
| ionization energy | |
| enthalpy of vaporization | |
| enthalpy of fusion | |
| standard enthalpy of formation | |
| electron | |
| electron shell | 2, 8, 18, 32, 28, 8, 2 |
 | |
| valence electron | 2 ⓘ |
 | |
| electron configuration | [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 | |
| Electrophilicity Index | |
| fundamental state of matter | |
| phase of matter | Solid |
| gaseous state of matter | |
| Boiling Point | |
| Melting Point | |
| critical pressure | |
| critical temperature | |
| triple point | |
| appearance | |
| color | Colorless
|
| 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 | |
| structure | |
| 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 | |
| C6 Dispersion Coefficient | |
| allotrope | |
| Neutron cross section | 2900
|
| 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 | |
| g-factor | |
| natural abundance | |
| radioactivity | ☢️ radioactive element |
| half-life | 0.8 ± 0.2 s
|
| spin | 5/2 |
| nuclear quadrupole moment | |
| time of discovery or invention | 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 | |
| g-factor | 0
|
| natural abundance | |
| radioactivity | ☢️ radioactive element |
| half-life | 21.1 ± 1.3 ms
|
| spin | 0 |
| nuclear quadrupole moment | 0
|
| time of discovery or invention | 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 | |
| g-factor | |
| natural abundance | |
| radioactivity | ☢️ radioactive element |
| half-life | 28 ± 2 s
|
| spin | 5/2 |
| nuclear quadrupole moment | |
| time of discovery or invention | 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 | |
| g-factor | 0
|
| natural abundance | |
| radioactivity | ☢️ radioactive element |
| half-life | 40.3 ± 0.9 s
|
| spin | 0 |
| nuclear quadrupole moment | 0
|
| time of discovery or invention | 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 | |
| g-factor | |
| natural abundance | |
| radioactivity | ☢️ radioactive element |
| half-life | 2.35 ± 0.18 m
|
| spin | 7/2 |
| nuclear quadrupole moment | |
| time of discovery or invention | 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 | |
| g-factor | 0
|
| natural abundance | |
| radioactivity | ☢️ radioactive element |
| half-life | 3.49 ± 0.15 m
|
| spin | 0 |
| nuclear quadrupole moment | 0
|
| time of discovery or invention | 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 | |
| g-factor | |
| natural abundance | |
| radioactivity | ☢️ radioactive element |
| half-life | 10.8 ± 0.3 m
|
| spin | 1/2 |
| nuclear quadrupole moment | 0
|
| time of discovery or invention | 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 | |
| g-factor | 0
|
| natural abundance | |
| radioactivity | ☢️ radioactive element |
| half-life | 19.5 ± 0.5 m
|
| spin | 0 |
| nuclear quadrupole moment | 0
|
| time of discovery or invention | 1956 |
| parity | + |
| decay mode | intensity |
|---|---|
| α (α emission) | 75% |
| ϵ (electron capture) | 25% |
245Cf
| mass number | 245 |
|---|---|
| neutron number | 147 |
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioactivity | ☢️ radioactive element |
| half-life | 45 ± 1.5 m
|
| spin | 1/2 |
| nuclear quadrupole moment | 0
|
| time of discovery or invention | 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 | |
| g-factor | 0
|
| natural abundance | |
| radioactivity | ☢️ radioactive element |
| half-life | 35.7 ± 0.5 h
|
| spin | 0 |
| nuclear quadrupole moment | 0
|
| time of discovery or invention | 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 | |
| g-factor | |
| natural abundance | |
| radioactivity | ☢️ radioactive element |
| half-life | 3.11 ± 0.03 h
|
| spin | 7/2 |
| nuclear quadrupole moment | |
| time of discovery or invention | 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 | |
| g-factor | 0
|
| natural abundance | |
| radioactivity | ☢️ radioactive element |
| half-life | 333.5 ± 2.8 d
|
| spin | 0 |
| nuclear quadrupole moment | 0
|
| time of discovery or invention | 1954 |
| parity | + |
| decay mode | intensity |
|---|---|
| α (α emission) | 100% |
| SF (spontaneous fission) | 0.0029% |
249Cf
| mass number | 249 |
|---|---|
| neutron number | 151 |
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioactivity | ☢️ radioactive element |
| half-life | 351 ± 2 y
|
| spin | 9/2 |
| nuclear quadrupole moment | |
| time of discovery or invention | 1954 |
| parity | - |
| decay mode | intensity |
|---|---|
| α (α emission) | 100% |
| SF (spontaneous fission) | 5% |
250Cf
| mass number | 250 |
|---|---|
| neutron number | 152 |
| Relative Atomic Mass | |
| g-factor | 0
|
| natural abundance | |
| radioactivity | ☢️ radioactive element |
| half-life | 13.08 ± 0.09 y
|
| spin | 0 |
| nuclear quadrupole moment | 0
|
| time of discovery or invention | 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 | |
| g-factor | |
| natural abundance | |
| radioactivity | ☢️ radioactive element |
| half-life | 898 ± 44 y
|
| spin | 1/2 |
| nuclear quadrupole moment | 0
|
| time of discovery or invention | 1954 |
| parity | + |
| decay mode | intensity |
|---|---|
| α (α emission) | 100% |
| SF (spontaneous fission) |
252Cf
| mass number | 252 |
|---|---|
| neutron number | 154 |
| Relative Atomic Mass | |
| g-factor | 0
|
| natural abundance | |
| radioactivity | ☢️ radioactive element |
| half-life | 2.645 ± 0.008 y
|
| spin | 0 |
| nuclear quadrupole moment | 0
|
| time of discovery or invention | 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 | |
| g-factor | |
| natural abundance | |
| radioactivity | ☢️ radioactive element |
| half-life | 17.81 ± 0.08 d
|
| spin | 7/2 |
| nuclear quadrupole moment | |
| time of discovery or invention | 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 | |
| g-factor | 0
|
| natural abundance | |
| radioactivity | ☢️ radioactive element |
| half-life | 60.5 ± 0.2 d
|
| spin | 0 |
| nuclear quadrupole moment | 0
|
| time of discovery or invention | 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 | |
| g-factor | |
| natural abundance | |
| radioactivity | ☢️ radioactive element |
| half-life | 85 ± 18 m
|
| spin | 7/2 |
| nuclear quadrupole moment | |
| time of discovery or invention | 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 | |
| g-factor | 0
|
| natural abundance | |
| radioactivity | ☢️ radioactive element |
| half-life | 12.3 ± 1.2 m
|
| spin | 0 |
| nuclear quadrupole moment | 0
|
| time of discovery or invention | 1980 |
| parity | + |
| decay mode | intensity |
|---|---|
| SF (spontaneous fission) | 100% |
| α (α emission) | |
| 2β− (double β− decay) |
history
| discoverer or inventor | G.T.Seaborg, S.G.Tompson, A.Ghiorso, K.Street Jr. |
|---|---|
| location of discovery | United States |
| time of discovery or invention | 1950 |
| etymology | Named after the state and University of California. |
| pronunciation | kal-eh-FOR-ni-em (English) |
source
| Abundance | |
|---|---|
| Abundance in Earth's crust | |
| natural abundance (ocean) | |
| natural abundance (human body) | 0 %
|
| natural abundance (meteoroid) | 0 %
|
| natural abundance (Sun) | 0 %
|
| Abundance in Universe | 0 %
|
