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transuranic element
Any element lying beyond uranium in the periodic table, i.e. any element of atomic number greater than 92. Except for the plutonium isotopes Pu-244 (half-life about 80 million years) and Pu-239 (continuous reformation in rock containing uranium by neutron capture in U-238 by neutrons from the spontaneous fission of U-238) detected in very small quantities, all transuranic elements must be produced artificially by suitable nuclear reactions. All are radioactive.
| Table of transuranic elements | ||
|---|---|---|
| Element name | Symbol | Atomic no. |
| Neptunium | Np | 93 |
| Plutonium | Pu | 94 |
| Americium | Am | 95 |
| Curium | Cm | 96 |
| Berkelium | Bk | 97 |
| Californium | Cf | 98 |
| Einsteinium | Es | 99 |
| Fermium | Fm | 100 |
| Mendelevium | Md | 101 |
| Nobelium | No | 102 |
| Lawrencium | Lw | 103 |
| Rutherfordium | Rf | 104 |
| Dubnium | Db | 105 |
| Seaborgium | Sb | 106 |
| Bohrium | Bh | 107 |
| Hassium | Hs | 108 |
| Meitnerium | Mt | 109 |
| Darmstadtium | Ds | 110 |
| Roentgenium | Rg | 111 |
| Not yet named | - | 112 |
| Not yet named | - | 114 |
| Not yet named | - | 115 |
Related categories
• ATOMIC AND NUCLEAR PHYSICS
• INORGANIC CHEMISTRY
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