Transuranium elements

found: Wikipedia, Aug. 13, 2012(Transuranium element. In chemistry, transuranium elements (also known as transuranic elements) are the chemical elements with atomic numbers greater than 92 (the atomic number of uranium). None of these elements are stable, and each of them decays radioactively into other elements. List of the transuranic elements by chemical series: Actinides: 93 neptunium Np; 94 plutonium Pu; 95 americium Am; 96 curium Cm; 97 berkelium Bk; 98 californium Cf; 99 einsteinium Es; 100 fermium Fm; 101 mendelevium Md; 102 nobelium No; 103 lawrencium Lr; Transactinide elements: 104 rutherfordium Rf; 105 dubnium Db; 106 seaborgium Sg; 107 bohrium Bh; 108 hassium Hs; 109 meitnerium Mt; 110 darmstadtium Ds; 111 roentgenium Rg; 112 copernicium Cn; 113 ununtrium Uut; 114 flerovium Fl; 115 ununpentium Uup; 116 livermorium Lv; 117 ununseptium Uus; 118 ununoctium Uuo)

found: Encyc. Britannica online, Aug. 13, 2012(transuranium element, any of the chemical elements that lie beyond uranium in the periodic table--i.e., those with atomic numbers greater than 92. Twenty-six of these elements have been discovered and named or are awaiting confirmation of their discovery. Eleven of them, from neptunium through lawrencium, belong to the actinoid series. The others, which have atomic numbers higher than 103, are referred to as the transactinoids. All the transuranium elements are unstable, decaying radioactively, with half-lives that range from tens of millions of years to mere fractions of a second.)