Four new elements have been added to the tail end of the periodic table, completing the seventh row. It's the first such addition in four years.
"The chemistry community is eager to see its most cherished table finally being completed down to the seventh row," said Jan Reedijk, president of inorganic chemistry research at the International Union of Pure and Applied Chemistry, the organization that verified the elements' discovery.
Element 113, so called because it has 113 protons, was isolated by a team at Japan's RIKEN research institute in 2012. Elements 115, 117 and 118 were discovered in collaborations between researchers in Dubna, Russia, and the U.S.'s Oak Ridge and Lawrence Livermore National Labs from 2010 to 2013. But before they can be confirmed and added to the periodic table, the scientists at IUPAC must carefully check the reports.
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Fortunately, the IUPAC group concluded that all four elements have been successfully created — although some don't stick around for long, decaying quickly into lighter, more stable elements.