| Atomic Number | 102 | 
|---|---|
| Atomic Weight | 259 | 
| Rhif màs | 248 | 
| Group | |
|---|---|
| Period | 7 | 
| Block | f | 
| Proton | 102 p+ | 
|---|---|
| Niwtron | 146 n0 | 
| Electron | 102 e- | 
| egni | |
|---|---|
| proton affinity | |
| electron affinity | |
| ionization energy | |
| enthalpy of vaporization | |
| enthalpy of fusion | |
| standard enthalpy of formation | |
| Electron | |
| plisgyn yr electron | 2, 8, 18, 32, 32, 8, 2 | 
| valence electron | 2 ⓘ | 
| trefn yr electronnau | [Rn] 5f14 7s2ⓘ 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 5f14 7s2 | 
| Cyflwr ocsidiad | 2, 3 | 
| Electronegatifedd | |
| Electrophilicity Index | |
| cyflwr sylfaenol mater | |
| cyflwr mater{ERROR} | |
| gaseous state of matter | |
| Boiling Point | |
| Melting Point | |
| critical pressure | |
| critical temperature | |
| triple point | |
| appearance | |
| lliw | Black | 
| appearance | |
| Mynegrif plygiant | |
| nodwedd ffisegol gwrthrych | |
| Thermal Conductivity | |
| thermal expansion | |
| molar heat capacity | |
| Specific Heat Capacity | |
| heat capacity ratio | |
| electrical properties | |
| type | |
| dargludedd trydanol | |
| Gwrthedd | |
| superconductivity | |
| magnetism | |
| type | |
| magnetic susceptibility (Mass) | |
| magnetic susceptibility (Molar) | |
| magnetic susceptibility (Volume) | |
| magnetic ordering | |
| Curie temperature | |
| Néel temperature | |
| strwythur | |
| Crystal Structure | {ERROR} | 
| lattice constant | |
| Lattice Angles | |
| nodwedd mecanyddol deunyddiau | |
| hardness | |
| bulk modulus | |
| shear modulus | |
| Young's modulus | |
| Poisson's ratio | |
| speed of sound | |
| classification | |
| Category | Actinides, Actinides | 
| CAS Group | |
| IUPAC Group | |
| Glawe Number | 46 | 
| Mendeleev Number | 40 | 
| Pettifor Number | 35 | 
| Geochemical Class | |
| Goldschmidt classification | synthetic | 
| Gas Basicity | |
|---|---|
| polarizability | |
| C6 Dispersion Coefficient | |
| allotrope | |
| Neutron cross section | |
| Neutron Mass Absorption | |
| quantum number | 1S0 | 
| space group | () | 
| Stable Isotopes | 0 | 
|---|---|
| Unstable Isotopes | 17 | 
| Natural Isotopes | 0 | 
| Rhif màs | 248 | 
|---|---|
| neutron number | 146 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| Dadfeilio ymbelydrol | ☢️ elfen ymbelydrol | 
| Hanner oes | |
| spin | 0 | 
| nuclear quadrupole moment | 0  | 
| dyddiad darganfod | 2003 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| SF (spontaneous fission) | 
| Rhif màs | 249 | 
|---|---|
| neutron number | 147 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| Dadfeilio ymbelydrol | ☢️ elfen ymbelydrol | 
| Hanner oes | 57 ± 12 us | 
| spin | 5/2 | 
| nuclear quadrupole moment | |
| dyddiad darganfod | 2003 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| β+ (β+ decay; β+ = ϵ + e+) | |
| α (α emission) | 
| Rhif màs | 250 | 
|---|---|
| neutron number | 148 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| Dadfeilio ymbelydrol | ☢️ elfen ymbelydrol | 
| Hanner oes | 5.08 ± 0.27 us | 
| spin | 0 | 
| nuclear quadrupole moment | 0  | 
| dyddiad darganfod | 2003 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| SF (spontaneous fission) | 100% | 
| α (α emission) | |
| β+ (β+ decay; β+ = ϵ + e+) | 
| Rhif màs | 251 | 
|---|---|
| neutron number | 149 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| Dadfeilio ymbelydrol | ☢️ elfen ymbelydrol | 
| Hanner oes | 800 ± 10 ms | 
| spin | 7/2 | 
| nuclear quadrupole moment | |
| dyddiad darganfod | 1967 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| α (α emission) | 83% | 
| β+ (β+ decay; β+ = ϵ + e+) | |
| SF (spontaneous fission) | 0.3% | 
| Rhif màs | 252 | 
|---|---|
| neutron number | 150 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| Dadfeilio ymbelydrol | ☢️ elfen ymbelydrol | 
| Hanner oes | 2.467 ± 0.016 s | 
| spin | 0 | 
| nuclear quadrupole moment | 0  | 
| dyddiad darganfod | 1967 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| α (α emission) | 67.6% | 
| SF (spontaneous fission) | 31.3% | 
| β+ (β+ decay; β+ = ϵ + e+) | 1.1% | 
| Rhif màs | 253 | 
|---|---|
| neutron number | 151 | 
| Relative Atomic Mass | |
| g-factor | -0.11777777777778 ± 0.017777777777778  | 
| natural abundance | |
| Dadfeilio ymbelydrol | ☢️ elfen ymbelydrol | 
| Hanner oes | 1.57 ± 0.02 m | 
| spin | 9/2 | 
| nuclear quadrupole moment | 5.9 ± 1.7  | 
| dyddiad darganfod | 1967 | 
| parity | - | 
| decay mode | intensity | 
|---|---|
| α (α emission) | 55% | 
| β+ (β+ decay; β+ = ϵ + e+) | |
| SF (spontaneous fission) | 
| Rhif màs | 254 | 
|---|---|
| neutron number | 152 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| Dadfeilio ymbelydrol | ☢️ elfen ymbelydrol | 
| Hanner oes | 51.2 ± 0.4 s | 
| spin | 0 | 
| nuclear quadrupole moment | 0  | 
| dyddiad darganfod | 1966 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| α (α emission) | 90% | 
| β+ (β+ decay; β+ = ϵ + e+) | 10% | 
| SF (spontaneous fission) | 0.17% | 
| Rhif màs | 255 | 
|---|---|
| neutron number | 153 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| Dadfeilio ymbelydrol | ☢️ elfen ymbelydrol | 
| Hanner oes | 3.52 ± 0.18 m | 
| spin | 1/2 | 
| nuclear quadrupole moment | 0  | 
| dyddiad darganfod | 1967 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| β+ (β+ decay; β+ = ϵ + e+) | 70% | 
| α (α emission) | 30% | 
| Rhif màs | 256 | 
|---|---|
| neutron number | 154 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| Dadfeilio ymbelydrol | ☢️ elfen ymbelydrol | 
| Hanner oes | 2.91 ± 0.05 s | 
| spin | 0 | 
| nuclear quadrupole moment | 0  | 
| dyddiad darganfod | 1963 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| α (α emission) | 99.45% | 
| SF (spontaneous fission) | 0.55% | 
| ϵ (electron capture) | 
| Rhif màs | 257 | 
|---|---|
| neutron number | 155 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| Dadfeilio ymbelydrol | ☢️ elfen ymbelydrol | 
| Hanner oes | 24.5 ± 0.5 s | 
| spin | 3/2 | 
| nuclear quadrupole moment | |
| dyddiad darganfod | 1967 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| α (α emission) | 85% | 
| β+ (β+ decay; β+ = ϵ + e+) | 15% | 
| SF (spontaneous fission) | 
| Rhif màs | 258 | 
|---|---|
| neutron number | 156 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| Dadfeilio ymbelydrol | ☢️ elfen ymbelydrol | 
| Hanner oes | 1.23 ± 0.12 ms | 
| spin | 0 | 
| nuclear quadrupole moment | 0  | 
| dyddiad darganfod | 1989 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| SF (spontaneous fission) | 100% | 
| α (α emission) | 
| Rhif màs | 259 | 
|---|---|
| neutron number | 157 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| Dadfeilio ymbelydrol | ☢️ elfen ymbelydrol | 
| Hanner oes | 58 ± 5 m | 
| spin | 9/2 | 
| nuclear quadrupole moment | |
| dyddiad darganfod | 1973 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| α (α emission) | 75% | 
| ϵ (electron capture) | 25% | 
| SF (spontaneous fission) | 10% | 
| Rhif màs | 260 | 
|---|---|
| neutron number | 158 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| Dadfeilio ymbelydrol | ☢️ elfen ymbelydrol | 
| Hanner oes | 106 ± 8 ms | 
| spin | 0 | 
| nuclear quadrupole moment | 0  | 
| dyddiad darganfod | 1985 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| SF (spontaneous fission) | 100% | 
| Rhif màs | 261 | 
|---|---|
| neutron number | 159 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| Dadfeilio ymbelydrol | ☢️ elfen ymbelydrol | 
| Hanner oes | |
| spin | |
| nuclear quadrupole moment | |
| dyddiad darganfod | |
| parity | 
| decay mode | intensity | 
|---|---|
| α (α emission) | 
| Rhif màs | 262 | 
|---|---|
| neutron number | 160 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| Dadfeilio ymbelydrol | ☢️ elfen ymbelydrol | 
| Hanner oes | |
| spin | 0 | 
| nuclear quadrupole moment | 0  | 
| dyddiad darganfod | 1988 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| SF (spontaneous fission) | 100% | 
| α (α emission) | 
| Rhif màs | 263 | 
|---|---|
| neutron number | 161 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| Dadfeilio ymbelydrol | ☢️ elfen ymbelydrol | 
| Hanner oes | |
| spin | |
| nuclear quadrupole moment | |
| dyddiad darganfod | |
| parity | 
| decay mode | intensity | 
|---|---|
| α (α emission) | |
| SF (spontaneous fission) | 
| Rhif màs | 264 | 
|---|---|
| neutron number | 162 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| Dadfeilio ymbelydrol | ☢️ elfen ymbelydrol | 
| Hanner oes | |
| spin | 0 | 
| nuclear quadrupole moment | 0  | 
| dyddiad darganfod | |
| parity | + | 
| decay mode | intensity | 
|---|---|
| α (α emission) | |
| SF (spontaneous fission) | 
| darganfyddwr neu ddyfeisiwr | Nobel Institute for Physics | 
|---|---|
| man darganfod | Sweden | 
| dyddiad darganfod | 1957 | 
| geirdarddiad | Named in honor of Alfred Nobel, who invented dynamite and founded Nobel prize. | 
| ynganiad | no-BELL-i-em (Saesneg) | 
| Abundance | |
|---|---|
| Abundance in Earth's crust | |
| natural abundance (cefnfor) | |
| natural abundance (corff dynol) | 0 % | 
| natural abundance (Awyrfaen) | 0 % | 
| natural abundance (Haul) | 0 % | 
| Abundance in Universe | 0 % |