The elements that can be prepared by nuclear reactions
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Since about 1940, a set of new elements with atomic numbers over 92 (the atomic number of the heaviest naturally occurring element, Uranium) have been artificially made. They are called the transuranium elements.
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Transmutation in the universe
More lithium, beryllium and boron were produced later, in a natural nuclear reaction, cosmic ray spallation. Stellar nucleosynthesis is responsible for all of the other elements occurring naturally in the universe as stable isotopes and primordial nuclide, from carbon to uranium.
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