ANSWERS: 6
  • In February of 2004, two new elements were fleetingly created in a Russian lab. Each has many more protons and neutrons in their nuclei than any naturally occurring elements found on Earth. The nuclei of the two new elements are crammed with 113 and 115 protons and reported in a paper in Physical Review C. The heaviest natural element, uranium, contains 92 protons, while the heaviest synthetic element officially confirmed by the International Union of Pure and Applied Chemistry is Darmstadtium, with 110 protons. Claims for elements with 111, 112, 114 and 116 protons are also being investigated. The new elements were created at a particle accelerator in Dubna, Russia, by a team of researchers from the Joint Institute for Nuclear Research in Dubna and the Lawrence Livermore National Laboratory in California, US. Other laboratories will have to vet the findings before the elements can be officially added to the periodic table. Until then, they will go by names indicating their atomic numbers: Ununtrium (113) and Ununpentium (115). (http://www.newscientist.com/news/news.jsp?id=ns99994628)
  • the last element was ununoctium(Uuo)118 .
  • The problem with describing their characteristics is that the recently created synthetic elements (i.e. not discovered in nature...yet) tend to break down very quickly and so there is no time for testing various things.
  • The last element unofficially to be discovered was unbibium on April 24, 2008. A group led by Amnon Marinov at the Hebrew University of Jerusalem claimed to have found single atoms of unbibium in naturally occurring thorium deposits at an abundance of between 10−11 and 10-12, relative to thorium.
  • Fartinium. Colorless and stinky.
  • Uranium was the last one discovered. Some have been synthesized since then, but they don't exist otherwise. https://en.wikipedia.org/wiki/Uranium

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