| Atomic Number | 94 | 
|---|---|
| Atomic Weight | 244 | 
| mass number | 221 | 
| Group | |
|---|---|
| Period | 7 | 
| Block | f | 
| proton | 94 p+ | 
|---|---|
| neutron | 127 n0 | 
| electron | 94 e- | 
| Atomic Radius | |
|---|---|
| molar volume | |
| covalent radius | |
| Metallic Radius | |
| ionic radius | |
| Crystal Radius | |
| Van der Waals radius | |
| density | 
| energy | |
|---|---|
| proton affinity | |
| electron affinity | |
| ionization energy | |
| enthalpy of vaporization | |
| enthalpy of fusion | |
| standard enthalpy of formation | |
| electron | |
| electron shell | 2, 8, 18, 32, 24, 8, 2 | 
| valence electron | 2 ⓘ | 
| electron configuration | [Rn] 5f6 7s2ⓘ 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 5f6 7s2 | 
| oxidation number | 2, 3, 4, 5, 6, 7, 8 | 
| 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 | |
| color | Black | 
| appearance | silvery white, tarnishing to dark gray in air | 
| 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) | 0.0000000317 m³/Kg | 
| magnetic susceptibility (Molar) | 0.000000007735 m³/mol | 
| magnetic susceptibility (Volume) | 0.0006282  | 
| magnetic ordering | |
| Curie temperature | |
| Néel temperature | |
| structure | |
| Crystal Structure | {ERROR} | 
| lattice constant | |
| Lattice Angles | π/2, 1.776571, π/2 | 
| mechanical property | |
| hardness | |
| bulk modulus | |
| shear modulus | |
| Young's modulus | |
| Poisson's ratio | 0.21  | 
| speed of sound | |
| classification | |
| Category | Actinides, Actinides | 
| CAS Group | |
| IUPAC Group | |
| Glawe Number | 38 | 
| Mendeleev Number | 24 | 
| Pettifor Number | 43 | 
| Geochemical Class | |
| Goldschmidt classification | synthetic | 
| Gas Basicity | |
|---|---|
| polarizability | |
| C6 Dispersion Coefficient | |
| allotrope | |
| Neutron cross section | 1.7  | 
| Neutron Mass Absorption | |
| quantum number | 7F0 | 
| space group | 11 (P121/m1) | 
| Stable Isotopes | 0 | 
|---|---|
| Unstable Isotopes | 27 | 
| Natural Isotopes | 0 | 
| mass number | 221 | 
|---|---|
| neutron number | 127 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | |
| spin | 9/2 | 
| nuclear quadrupole moment | |
| time of discovery or invention | |
| parity | + | 
| decay mode | intensity | 
|---|---|
| α (α emission) | |
| SF (spontaneous fission) | 
| mass number | 222 | 
|---|---|
| neutron number | 128 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | |
| spin | 0 | 
| nuclear quadrupole moment | 0  | 
| time of discovery or invention | |
| parity | + | 
| decay mode | intensity | 
|---|---|
| α (α emission) | |
| SF (spontaneous fission) | 
| mass number | 223 | 
|---|---|
| neutron number | 129 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | |
| spin | 9/2 | 
| nuclear quadrupole moment | |
| time of discovery or invention | |
| parity | + | 
| decay mode | intensity | 
|---|---|
| α (α emission) | |
| SF (spontaneous fission) | 
| mass number | 224 | 
|---|---|
| neutron number | 130 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | |
| spin | 0 | 
| nuclear quadrupole moment | 0  | 
| time of discovery or invention | |
| parity | + | 
| decay mode | intensity | 
|---|---|
| α (α emission) | |
| SF (spontaneous fission) | 
| mass number | 225 | 
|---|---|
| neutron number | 131 | 
| 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 | 
|---|---|
| α (α emission) | |
| SF (spontaneous fission) | 
| mass number | 226 | 
|---|---|
| neutron number | 132 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | |
| spin | 0 | 
| nuclear quadrupole moment | 0  | 
| time of discovery or invention | |
| parity | + | 
| decay mode | intensity | 
|---|---|
| α (α emission) | |
| SF (spontaneous fission) | 
| mass number | 227 | 
|---|---|
| neutron number | 133 | 
| 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) | 
| mass number | 228 | 
|---|---|
| neutron number | 134 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 2.1 ± 1.3 s | 
| spin | 0 | 
| nuclear quadrupole moment | 0  | 
| time of discovery or invention | 1994 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| α (α emission) | 100% | 
| β+ (β+ decay; β+ = ϵ + e+) | 
| mass number | 229 | 
|---|---|
| neutron number | 135 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 91 ± 26 s | 
| spin | 3/2 | 
| nuclear quadrupole moment | |
| time of discovery or invention | 1994 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| α (α emission) | 50% | 
| β+ (β+ decay; β+ = ϵ + e+) | 50% | 
| SF (spontaneous fission) | 7% | 
| mass number | 230 | 
|---|---|
| neutron number | 136 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 105 ± 10 s | 
| spin | 0 | 
| nuclear quadrupole moment | 0  | 
| time of discovery or invention | 1990 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| α (α emission) | 100% | 
| β+ (β+ decay; β+ = ϵ + e+) | 
| mass number | 231 | 
|---|---|
| neutron number | 137 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 8.6 ± 0.5 m | 
| spin | 3/2 | 
| nuclear quadrupole moment | |
| time of discovery or invention | 1999 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| β+ (β+ decay; β+ = ϵ + e+) | |
| α (α emission) | 13% | 
| mass number | 232 | 
|---|---|
| neutron number | 138 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 33.7 ± 0.5 m | 
| spin | 0 | 
| nuclear quadrupole moment | 0  | 
| time of discovery or invention | 1973 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| ϵ (electron capture) | |
| α (α emission) | 20% | 
| mass number | 233 | 
|---|---|
| neutron number | 139 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 20.9 ± 0.4 m | 
| spin | 5/2 | 
| nuclear quadrupole moment | |
| time of discovery or invention | 1957 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| β+ (β+ decay; β+ = ϵ + e+) | 100% | 
| α (α emission) | 0.12% | 
| mass number | 234 | 
|---|---|
| neutron number | 140 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 8.8 ± 0.1 h | 
| spin | 0 | 
| nuclear quadrupole moment | 0  | 
| time of discovery or invention | 1949 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| ϵ (electron capture) | 94% | 
| α (α emission) | 6% | 
| mass number | 235 | 
|---|---|
| neutron number | 141 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 25.3 ± 0.5 m | 
| spin | 5/2 | 
| nuclear quadrupole moment | |
| time of discovery or invention | 1957 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| β+ (β+ decay; β+ = ϵ + e+) | 99.9972% | 
| α (α emission) | 0.0028% | 
| mass number | 236 | 
|---|---|
| neutron number | 142 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 2.858 ± 0.008 y | 
| spin | 0 | 
| nuclear quadrupole moment | 0  | 
| time of discovery or invention | 1949 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| α (α emission) | 100% | 
| SF (spontaneous fission) | 1.9% | 
| 28Mg | 2% | 
| 2β+ (double β+ decay) | 
| mass number | 237 | 
|---|---|
| neutron number | 143 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 45.64 ± 0.04 d | 
| spin | 7/2 | 
| nuclear quadrupole moment | |
| time of discovery or invention | 1949 | 
| parity | - | 
| decay mode | intensity | 
|---|---|
| ϵ (electron capture) | 99.9958% | 
| α (α emission) | 0.0042% | 
| mass number | 238 | 
|---|---|
| neutron number | 144 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 87.7 ± 0.1 y | 
| spin | 0 | 
| nuclear quadrupole moment | 0  | 
| time of discovery or invention | 1949 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| α (α emission) | 100% | 
| SF (spontaneous fission) | 1.9% | 
| 32Si | 1.4% | 
| 30Mg | 6% | 
| mass number | 239 | 
|---|---|
| neutron number | 145 | 
| Relative Atomic Mass | |
| g-factor | 0.404 ± 0.008  | 
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 24.11 ± 0.03 ky | 
| spin | 1/2 | 
| nuclear quadrupole moment | 0  | 
| time of discovery or invention | 1946 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| α (α emission) | 100% | 
| SF (spontaneous fission) | 3.1% | 
| mass number | 240 | 
|---|---|
| neutron number | 146 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 6.561 ± 0.007 ky | 
| spin | 0 | 
| nuclear quadrupole moment | 0  | 
| time of discovery or invention | 1949 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| α (α emission) | 100% | 
| SF (spontaneous fission) | 5.796% | 
| 34Si | 1.3% | 
| mass number | 241 | 
|---|---|
| neutron number | 147 | 
| Relative Atomic Mass | |
| g-factor | -0.2712 ± 0.0056  | 
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 14.329 ± 0.029 y | 
| spin | 5/2 | 
| nuclear quadrupole moment | 6  | 
| time of discovery or invention | 1949 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| β− (β− decay) | 100% | 
| α (α emission) | 0.00245% | 
| SF (spontaneous fission) | 2.4% | 
| mass number | 242 | 
|---|---|
| neutron number | 148 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 375 ± 2 ky | 
| spin | 0 | 
| nuclear quadrupole moment | 0  | 
| time of discovery or invention | 1950 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| α (α emission) | 100% | 
| SF (spontaneous fission) | 5.51% | 
| mass number | 243 | 
|---|---|
| neutron number | 149 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 4.9553 ± 0.0025 h | 
| spin | 7/2 | 
| nuclear quadrupole moment | |
| time of discovery or invention | 1951 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| β− (β− decay) | 100% | 
| mass number | 244 | 
|---|---|
| neutron number | 150 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 81.3 ± 0.3 My | 
| spin | 0 | 
| nuclear quadrupole moment | 0  | 
| time of discovery or invention | 1954 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| α (α emission) | 99.877% | 
| SF (spontaneous fission) | 0.123% | 
| 2β− (double β− decay) | 7.3% | 
| mass number | 245 | 
|---|---|
| neutron number | 151 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 10.5 ± 0.1 h | 
| spin | 9/2 | 
| nuclear quadrupole moment | |
| time of discovery or invention | 1955 | 
| parity | - | 
| decay mode | intensity | 
|---|---|
| β− (β− decay) | 100% | 
| mass number | 246 | 
|---|---|
| neutron number | 152 | 
| Relative Atomic Mass | |
| g-factor | 0  | 
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 10.84 ± 0.02 d | 
| spin | 0 | 
| nuclear quadrupole moment | 0  | 
| time of discovery or invention | 1955 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| β− (β− decay) | 100% | 
| mass number | 247 | 
|---|---|
| neutron number | 153 | 
| Relative Atomic Mass | |
| g-factor | |
| natural abundance | |
| radioactivity | ☢️ radioactive element | 
| half-life | 2.27 ± 0.23 d | 
| spin | 1/2 | 
| nuclear quadrupole moment | 0  | 
| time of discovery or invention | 1983 | 
| parity | + | 
| decay mode | intensity | 
|---|---|
| β− (β− decay) | 100% | 

| discoverer or inventor | G.T.Seaborg, J.W.Kennedy, E.M.McMillan, A.C.Wohl | 
|---|---|
| location of discovery | United States | 
| time of discovery or invention | 1940 | 
| etymology | Named for the planet Pluto. | 
| pronunciation | ploo-TOE-ni-em (Ingarihi) | 
| Abundance | |
|---|---|
| Abundance in Earth's crust | |
| natural abundance (Moana nui) | |
| natural abundance (human body) | 0 % | 
| natural abundance (meteoroid) | 0 % | 
| natural abundance (Te Rā) | 0 % | 
| Abundance in Universe | 0 % |