| Atomic Number | 90 | 
|---|---|
| Atomic Weight | 232.0377 | 
| mass number | 232 | 
| Group | |
|---|---|
| Period | 7 | 
| Block | f | 
| proton | 90 p+ | 
|---|---|
| neutron | 142 n0 | 
| elettron | 90 e- | 
| Atomic Radius | |
|---|---|
| molar volume | |
| covalent radius | |
| Metallic Radius | |
| ionic radius | |
| Crystal Radius | |
| Van der Waals radius | |
| densità | 
| enerġija | |
|---|---|
| proton affinity | |
| electron affinity | |
| ionization energy | |
| enthalpy of vaporization | |
| enthalpy of fusion | |
| standard enthalpy of formation | |
| elettron | |
| electron shell | 2, 8, 18, 32, 18, 10, 2 | 
| valence electron | 2 ⓘ | 
| electron configuration | [Rn] 6d2 7s2ⓘ 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 6d2 7s2 | 
| oxidation number | -1, 1, 2, 3, 4 | 
| electronegativity | 1.3 | 
| Electrophilicity Index | |
| fundamental state of matter | |
| phase of matter{ERROR} | |
| gaseous state of matter | |
| Boiling Point | |
| Melting Point | |
| critical pressure | |
| critical temperature | |
| triple point | |
| appearance | |
| kulur | Black | 
| appearance | silvery, often with black tarnish | 
| refractive index | |
| thermodynamic material property | |
| Thermal Conductivity | |
| thermal expansion | |
| molar heat capacity | |
| Specific Heat Capacity | |
| heat capacity ratio | |
| electrical properties | |
| type | Conductor | 
| electrical conductivity | |
| electrical resistivity | |
| superconductivity | |
| magnetism | |
| type | paramagnetic | 
| magnetic susceptibility (Mass) | 0.0000000072 m³/Kg | 
| magnetic susceptibility (Molar) | 0.0000000017 m³/mol | 
| magnetic susceptibility (Volume) | 0.000084  | 
| magnetic ordering | |
| Curie temperature | |
| Néel temperature | |
| structure | |
| Crystal Structure | {ERROR} | 
| lattice constant | |
| Lattice Angles | π/2, π/2, π/2 | 
| mechanical property | |
| hardness | |
| bulk modulus | |
| shear modulus | |
| Young's modulus | |
| Poisson's ratio | 0.27  | 
| speed of sound | |
| classification | |
| Category | Actinides, Actinides | 
| CAS Group | |
| IUPAC Group | |
| Glawe Number | 34 | 
| Mendeleev Number | 16 | 
| Pettifor Number | 47 | 
| Geochemical Class | rare earth & related | 
| Goldschmidt classification | litophile | 
| Gas Basicity | |
|---|---|
| polarizability | |
| C6 Dispersion Coefficient | |
| allotrope | |
| Neutron cross section | 7.4  | 
| Neutron Mass Absorption | 0.001  | 
| quantum number | 3F2 | 
| space group | 225 (Fm_3m) | 
| Stable Isotopes | 0 | 
|---|---|
| Unstable Isotopes | 32 | 
| Natural Isotopes | 2 | 
| mass number | 208 | 
|---|---|
| neutron number | 118 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 2.4 ± 1.2 ms | 
| spin | 0 | 
| nuclear quadrupole moment | 0  | 
| time of discovery or invention | 2010 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| α (α emission) | 100% | 
| mass number | 209 | 
|---|---|
| neutron number | 119 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | |
| spin | 5/2 | 
| nuclear quadrupole moment | |
| time of discovery or invention | |
| parity | - | 
| decay mode | intensity | 
|---|---|
| α (α emission) | |
| β+ (β+ decay; β+ = ϵ + e+) | 
| mass number | 210 | 
|---|---|
| neutron number | 120 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 16 ± 3.6 ms | 
| spin | 0 | 
| nuclear quadrupole moment | 0  | 
| time of discovery or invention | 1995 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| α (α emission) | 100% | 
| β+ (β+ decay; β+ = ϵ + e+) | 
| mass number | 211 | 
|---|---|
| neutron number | 121 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 48 ± 20 ms | 
| spin | 5/2 | 
| nuclear quadrupole moment | |
| time of discovery or invention | 1995 | 
| parity | - | 
| decay mode | intensity | 
|---|---|
| α (α emission) | 100% | 
| β+ (β+ decay; β+ = ϵ + e+) | 
| mass number | 212 | 
|---|---|
| neutron number | 122 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 31.7 ± 1.3 ms | 
| spin | 0 | 
| nuclear quadrupole moment | 0  | 
| time of discovery or invention | 1980 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| α (α emission) | 100% | 
| β+ (β+ decay; β+ = ϵ + e+) | 
| mass number | 213 | 
|---|---|
| neutron number | 123 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 144 ± 21 ms | 
| spin | 5/2 | 
| nuclear quadrupole moment | |
| time of discovery or invention | 1968 | 
| parity | - | 
| decay mode | intensity | 
|---|---|
| α (α emission) | 100% | 
| β+ (β+ decay; β+ = ϵ + e+) | 
| mass number | 214 | 
|---|---|
| neutron number | 124 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 87 ± 10 ms | 
| spin | 0 | 
| nuclear quadrupole moment | 0  | 
| time of discovery or invention | 1968 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| α (α emission) | 100% | 
| β+ (β+ decay; β+ = ϵ + e+) | 
| mass number | 215 | 
|---|---|
| neutron number | 125 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 1.35 ± 0.14 s | 
| spin | 1/2 | 
| nuclear quadrupole moment | 0  | 
| time of discovery or invention | 1968 | 
| parity | - | 
| decay mode | intensity | 
|---|---|
| α (α emission) | 100% | 
| mass number | 216 | 
|---|---|
| neutron number | 126 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 26.28 ± 0.16 ms | 
| spin | 0 | 
| nuclear quadrupole moment | 0  | 
| time of discovery or invention | 1968 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| α (α emission) | 100% | 
| β+ (β+ decay; β+ = ϵ + e+) | 
| mass number | 217 | 
|---|---|
| neutron number | 127 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 248 ± 4 us | 
| spin | 9/2 | 
| nuclear quadrupole moment | |
| time of discovery or invention | 1968 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| α (α emission) | 100% | 
| mass number | 218 | 
|---|---|
| neutron number | 128 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 122 ± 5 ns | 
| spin | 0 | 
| nuclear quadrupole moment | 0  | 
| time of discovery or invention | 1973 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| α (α emission) | 100% | 
| mass number | 219 | 
|---|---|
| neutron number | 129 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 1.023 ± 0.018 us | 
| spin | 9/2 | 
| nuclear quadrupole moment | |
| time of discovery or invention | 1973 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| α (α emission) | 100% | 
| β+ (β+ decay; β+ = ϵ + e+) | 
| mass number | 220 | 
|---|---|
| neutron number | 130 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 10.2 ± 0.3 us | 
| spin | 0 | 
| nuclear quadrupole moment | 0  | 
| time of discovery or invention | 1973 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| α (α emission) | 100% | 
| ϵ (electron capture) | 
| mass number | 221 | 
|---|---|
| neutron number | 131 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 1.75 ± 0.02 ms | 
| spin | 7/2 | 
| nuclear quadrupole moment | |
| time of discovery or invention | 1970 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| α (α emission) | 100% | 
| mass number | 222 | 
|---|---|
| neutron number | 132 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 2.24 ± 0.03 ms | 
| spin | 0 | 
| nuclear quadrupole moment | 0  | 
| time of discovery or invention | 1970 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| α (α emission) | 100% | 
| ϵ (electron capture) | 
| mass number | 223 | 
|---|---|
| neutron number | 133 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 600 ± 20 ms | 
| spin | 5/2 | 
| nuclear quadrupole moment | |
| time of discovery or invention | 1952 | 
| parity | 
| decay mode | intensity | 
|---|---|
| α (α emission) | 100% | 
| mass number | 224 | 
|---|---|
| neutron number | 134 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 1.04 ± 0.02 s | 
| spin | 0 | 
| nuclear quadrupole moment | 0  | 
| time of discovery or invention | 1949 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| α (α emission) | 100% | 
| 2β+ (double β+ decay) | 
| mass number | 225 | 
|---|---|
| neutron number | 135 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 8.75 ± 0.04 m | 
| spin | 3/2 | 
| nuclear quadrupole moment | |
| time of discovery or invention | 1949 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| α (α emission) | 90% | 
| ϵ (electron capture) | 
| mass number | 226 | 
|---|---|
| neutron number | 136 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 30.7 ± 0.03 m | 
| spin | 0 | 
| nuclear quadrupole moment | 0  | 
| time of discovery or invention | 1948 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| α (α emission) | 100% | 
| 18O | 3.2% | 
| mass number | 227 | 
|---|---|
| neutron number | 137 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 18.693 ± 0.004 d | 
| spin | 1/2 | 
| nuclear quadrupole moment | 0  | 
| time of discovery or invention | 1906 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| α (α emission) | 100% | 
| mass number | 228 | 
|---|---|
| neutron number | 138 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 1.9125 ± 0.0007 y | 
| spin | 0 | 
| nuclear quadrupole moment | 0  | 
| time of discovery or invention | 1905 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| α (α emission) | 100% | 
| 20O | 1.13% | 
| mass number | 229 | 
|---|---|
| neutron number | 139 | 
| Relative Atomic Mass | |
| g-factor | 0.184 ± 0.016  | 
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 7.916 ± 0.017 ky | 
| spin | 5/2 | 
| nuclear quadrupole moment | 3.11 ± 0.06  | 
| time of discovery or invention | 1947 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| α (α emission) | 100% | 
| mass number | 230 | 
|---|---|
| neutron number | 140 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | 0.02 ± 0.02  | 
| radioactivity | ☢️ radioactive element | 
| half-life | 75.4 ± 0.3 ky | 
| spin | 0 | 
| nuclear quadrupole moment | 0  | 
| time of discovery or invention | 1907 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| α (α emission) | 100% | 
| SF (spontaneous fission) | 4% | 
| 24Ne (heavy cluster emission) | 5.8% | 
| mass number | 231 | 
|---|---|
| neutron number | 141 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 25.52 ± 0.01 h | 
| spin | 5/2 | 
| nuclear quadrupole moment | |
| time of discovery or invention | 1911 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| β− (β− decay) | 100% | 
| mass number | 232 | 
|---|---|
| neutron number | 142 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | 99.98 ± 0.02  | 
| radioactivity | ☢️ radioactive element | 
| half-life | 14 ± 0.1 Gy | 
| spin | 0 | 
| nuclear quadrupole moment | 0  | 
| time of discovery or invention | 1898 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| α (α emission) | 100% | 
| SF (spontaneous fission) | 1.1% | 
| 26Ne | 2.78% | 
| 2β− (double β− decay) | 
| mass number | 233 | 
|---|---|
| neutron number | 143 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 21.83 ± 0.04 m | 
| spin | 1/2 | 
| nuclear quadrupole moment | 0  | 
| time of discovery or invention | 1935 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| β− (β− decay) | 100% | 
| mass number | 234 | 
|---|---|
| neutron number | 144 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 24.107 ± 0.024 d | 
| spin | 0 | 
| nuclear quadrupole moment | 0  | 
| time of discovery or invention | 1900 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| β− (β− decay) | 100% | 
| α (α emission) | 
| mass number | 235 | 
|---|---|
| neutron number | 145 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 7.2 ± 0.1 m | 
| spin | 1/2 | 
| nuclear quadrupole moment | 0  | 
| time of discovery or invention | 1969 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| β− (β− decay) | 100% | 
| mass number | 236 | 
|---|---|
| neutron number | 146 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 37.3 ± 1.5 m | 
| spin | 0 | 
| nuclear quadrupole moment | 0  | 
| time of discovery or invention | 1973 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| β− (β− decay) | 100% | 
| mass number | 237 | 
|---|---|
| neutron number | 147 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 4.8 ± 0.5 m | 
| spin | 5/2 | 
| nuclear quadrupole moment | |
| time of discovery or invention | 1993 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| β− (β− decay) | 100% | 
| mass number | 238 | 
|---|---|
| neutron number | 148 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 9.4 ± 2 m | 
| spin | 0 | 
| nuclear quadrupole moment | 0  | 
| time of discovery or invention | 1999 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| β− (β− decay) | 100% | 
| mass number | 239 | 
|---|---|
| neutron number | 149 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | |
| spin | 7/2 | 
| nuclear quadrupole moment | |
| time of discovery or invention | |
| parity | + | 
| decay mode | intensity | 
|---|---|
| β− (β− decay) | 

| discoverer or inventor | Jöns Berzelius | 
|---|---|
| location of discovery | Sweden | 
| time of discovery or invention | 1828 | 
| etimoloġija | Named for Thor, Norse god of thunder. | 
| pronunciation | THOR-i-em (Ingliż) | 
| Abundance | |
|---|---|
| Abundance in Earth's crust | |
| natural abundance (ocean) | |
| natural abundance (human body) | 0 % | 
| natural abundance (meteoroid) | 0.0000039 % | 
| natural abundance (Xemx) | 0.00000003 % | 
| Abundance in Universe | 0.00000004 % |