This announcement comes along with the discovery and assignment of elements with atomic numbers 115, 117 and 118. The news also marks the completion of the the 7th period of the periodic table.
Element 113 or Ununtrium has been discovered by a RIKEN group under the leadership of Kosuke Morita. This announcement comes along with the discovery and assignment of elements with atomic numbers 115, 117 and 118. The news also marks the completion of the the 7th period of the periodic table.
Following the two initial events, however, the team's luck seemed to run dry. "For over seven years," says Morita, "we continued to search for data conclusively identifying element 113, but we just never saw another event. I was not prepared to give up, however, as I believed that one day, if we persevered, luck would fall upon us again."
For Morita, then, part of the coming year will be devoted to thinking of and proposing a formal name for element 113, but he is also looking forward to the next step in his research. "Now that we have conclusively demonstrated the existence of element 113," he says, "we plan to look to the uncharted territory of element 119 and beyond, aiming to examine the chemical properties of the elements in the seventh and eighth rows of the periodic table, and someday to discover the island of stability."
"A particular difficulty in establishing these new elements is that they decay into hitherto unknown isotopes of slightly lighter elements that also need to be unequivocally identified" commented JWP chair Professor Paul J. Karol, "but in the future we hope to improve methods that can directly measure the atomic number, Z".
"The chemistry community is eager to see its most cherished table finally being completed down to the seventh row. IUPAC has now initiated the process of formalizing names and symbols for these elements temporarily named as ununtrium, (Uut or element 113), ununpentium (Uup, element 115), ununseptium (Uus, element 117), and ununoctium (Uuo, element 118)" said Professor Jan Reedijk, President of the Inorganic Chemistry Division of IUPAC.
"As the global organization that provides objective scientific expertise and develops the essential tools for the application and communication of chemical knowledge for the benefit of humankind, the International Union of Pure and Applied Chemistry is pleased and honored to make this announcement concerning elements 113, 115, 117, and 118 and the completion of the seventh row of the periodic table of the elements," said IUPAC President Dr. Mark C. Cesa, adding that, "we are excited about these new elements, and we thank the dedicated scientists who discovered them for their painstaking work, as well the members of the IUPAC/IUPAP Joint Working Party for completing their essential and critically important task."
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