found: 2009014943: The transactinides : rutherfordium, dubnium, seaborgium, bohrium, hassium, meitnerium, darmstadtium, and roentgenium, 2010:ECIP galley (transactinides are the elements with atomic numbers of 104 and higher. They are the largest and heaviest of all the elements. Because of this, they are sometimes called the superheavy elements)
found: Britannica online, Apr. 13, 2009(Superheavy element)
found: Wikipedia, Apr. 13, 2009(In chemistry, transactinide elements are the chemical elements with atomic numbers greater than those of the actinides ... transactinide elements are also called super-heavy elements; the term transactinide is an adjective, and is not commonly used alone as a noun to refer to the transactinide elements) Aug. 31, 2012 (under Transuranium element: Super-heavy elements, (also known as super heavy atoms, commonly abbreviated SHE) may refer to elements beyond atomic number 100, but also may refer to all transuranium elements. The transactinide elements are beginning with rutherfordium (atomic number 104). They have only been made artificially; under Transactinide element: In chemistry, transactinide elements (also, transactinides, or super-heavy elements) are the chemical elements with atomic numbers greater than those of the actinides, the heaviest of which is lawrencium (103). Transactinides are radioactive and have only been obtained synthetically in laboratories. List of the 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: Gupta, M. The superheavy elements, 2010, via SciTopics website, Aug. 31, 2012(The superheavy elements (SHE) are traditionally considered to be those that lie above element 103 (Lawrencium, Lr), the last of the actinides. Starting with Rutherfordium (Rf), element 104, these elements are sometimes referred to as the super-transactinides. Collectively, they represent the very top end of the Periodic Table of Elements. ... SHE are hypothesised to exist near the next (predicted) double shell closure above Lead where they have may have surprisingly long half-lives, maybe even on the order of millions of years.)
