Transuranium Element
Transuranium Element : Chemical element in the classification of elements, the atomic number of which is greater than 92, that of uranium. Except for the plutonium isotopes Pu-244 (half-life about 80 million years) and Pu-239 (continuous reformation in uranium by neutron capture in U-238 by neutrons from the spontaneous fission of U-238) detected in very small quantities, all transuranium elements must be produced artificially.
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