Element, Artificial
Element, Artificial : Element not or no longer occurring on earth, but artificially generated by nuclear reaction. The artificial elements include the elements technetium (atomic number Z = 43), promethium (Z = 61) and the transuraniums (Z > 92). A total of 118 elements are therefore known today. In the 70's, it could be verified that very low traces of plutonium occur in nature resulting from natural nuclear fissions (about 1 plutonium atom per 1012 uranium atoms)
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