| Atomic Number | 98 | 
|---|---|
| Atomic Weight | 251 | 
| жингийн тоо | 237 | 
| Group | |
|---|---|
| Period | 7 | 
| Block | f | 
| Протон | 98 p+ | 
|---|---|
| Нейтрон | 139 n0 | 
| Электрон | 98 e- | 
| Atomic Radius | |
|---|---|
| molar volume | |
| Covalent Radius | |
| Metallic Radius | |
| ionic radius | |
| Crystal Radius | |
| Van der Waals radius | |
| density | 
| энерги | |
|---|---|
| proton affinity | |
| electron affinity | |
| ionization energy | |
| enthalpy of vaporization | |
| enthalpy of fusion | |
| standard enthalpy of formation | |
| Электрон | |
| 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 | 
| Исэлдэлтийн зэрэг | 2, 3, 4, 5 | 
| Цахилгаан сөрөг чанар | |
| Electrophilicity Index | |
| fundamental state of matter | |
| phase of matter{ERROR} | |
| gaseous state of matter | |
| Boiling Point | |
| Melting Point | |
| critical pressure | |
| critical temperature | |
| Гурван фазын цэг | |
| appearance | |
| Өнгө | Black | 
| appearance | silvery | 
| Хугалах илтгэгч | |
| thermodynamic material property | |
| Thermal Conductivity | |
| thermal expansion | |
| molar heat capacity | |
| Specific Heat Capacity | |
| heat capacity ratio | |
| electrical properties | |
| type | |
| electrical conductivity | |
| electrical resistivity | |
| Хэт дамжуулагч | |
| magnetism | |
| type | |
| magnetic susceptibility (Mass) | |
| magnetic susceptibility (Molar) | |
| magnetic susceptibility (Volume) | |
| magnetic ordering | |
| Curie temperature | |
| Néel temperature | |
| structure | |
| Crystal Structure | {ERROR} | 
| lattice constant | |
| Lattice Angles | π/2, π/2, 2 π/3 | 
| mechanical property | |
| Хатуулаг | |
| bulk modulus | |
| shear modulus | |
| Young's modulus | |
| Poisson's ratio | |
| Дууны хурд | |
| classification | |
| Category | Actinides, Actinides | 
| CAS Group | |
| IUPAC Group | |
| Glawe Number | 42 | 
| Mendeleev Number | 32 | 
| Pettifor Number | 39 | 
| Geochemical Class | |
| Goldschmidt classification | synthetic | 
| Gas Basicity | |
|---|---|
| polarizability | |
| C6 Dispersion Coefficient | |
| allotrope | |
| Neutron cross section | 2,900  | 
| Neutron Mass Absorption | |
| quantum number | 5I8 | 
| space group | 194 (P63/mmc) | 
| Stable Isotopes | 0 | 
|---|---|
| Unstable Isotopes | 20 | 
| Natural Isotopes | 0 | 
| жингийн тоо | 237 | 
|---|---|
| neutron number | 139 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| Цацраг идэвхт задрал | ☢️ 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+) | 
| жингийн тоо | 238 | 
|---|---|
| neutron number | 140 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| Цацраг идэвхт задрал | ☢️ 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% | 
| жингийн тоо | 239 | 
|---|---|
| neutron number | 141 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| Цацраг идэвхт задрал | ☢️ 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+) | 
| жингийн тоо | 240 | 
|---|---|
| neutron number | 142 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| Цацраг идэвхт задрал | ☢️ 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+) | 
| жингийн тоо | 241 | 
|---|---|
| neutron number | 143 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| Цацраг идэвхт задрал | ☢️ 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% | 
| жингийн тоо | 242 | 
|---|---|
| neutron number | 144 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| Цацраг идэвхт задрал | ☢️ 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% | 
| жингийн тоо | 243 | 
|---|---|
| neutron number | 145 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| Цацраг идэвхт задрал | ☢️ 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% | 
| жингийн тоо | 244 | 
|---|---|
| neutron number | 146 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| Цацраг идэвхт задрал | ☢️ 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% | 
| жингийн тоо | 245 | 
|---|---|
| neutron number | 147 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| Цацраг идэвхт задрал | ☢️ 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% | 
| жингийн тоо | 246 | 
|---|---|
| neutron number | 148 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| Цацраг идэвхт задрал | ☢️ 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) | 
| жингийн тоо | 247 | 
|---|---|
| neutron number | 149 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| Цацраг идэвхт задрал | ☢️ 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% | 
| жингийн тоо | 248 | 
|---|---|
| neutron number | 150 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| Цацраг идэвхт задрал | ☢️ 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% | 
| жингийн тоо | 249 | 
|---|---|
| neutron number | 151 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| Цацраг идэвхт задрал | ☢️ 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% | 
| жингийн тоо | 250 | 
|---|---|
| neutron number | 152 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| Цацраг идэвхт задрал | ☢️ 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% | 
| жингийн тоо | 251 | 
|---|---|
| neutron number | 153 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| Цацраг идэвхт задрал | ☢️ 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) | 
| жингийн тоо | 252 | 
|---|---|
| neutron number | 154 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| Цацраг идэвхт задрал | ☢️ 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% | 
| жингийн тоо | 253 | 
|---|---|
| neutron number | 155 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| Цацраг идэвхт задрал | ☢️ 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% | 
| жингийн тоо | 254 | 
|---|---|
| neutron number | 156 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| Цацраг идэвхт задрал | ☢️ 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) | 
| жингийн тоо | 255 | 
|---|---|
| neutron number | 157 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| Цацраг идэвхт задрал | ☢️ 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) | 
| жингийн тоо | 256 | 
|---|---|
| neutron number | 158 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| Цацраг идэвхт задрал | ☢️ 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) | 

| 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 (англи) | 
| Abundance | |
|---|---|
| Abundance in Earth's crust | |
| natural abundance (Далай) | |
| natural abundance (Хүний бие) | 0 % | 
| natural abundance (Солир) | 0 % | 
| natural abundance (Нар) | 0 % | 
| Abundance in Universe | 0 % |