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, usually involving bombardment with neutrons or alpha particles. All are radioactive.
Related categories ATOMIC AND NUCLEAR PHYSICS
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