7th row of periodic table now complete
The International Union of Pure and Applied Chemistry (IUPAC) has officially confirmed the permanent addition of four new elements to the periodic table. The IUPAC had announced last week that all four elements with atomic number 113, 115, 117 and 118 have met the criteria for discovery.
All these four elements are the first to be added to the periodic table since 2011. The addition of these new elements also completes the seventh row of the periodic table.
The elements, discovered by scientists in Japan, Russia and America, are the first to be added to the table since 2011, when elements 114 and 116 were added.
IUPAC announced that a Russian-American team of scientists at the Joint Institute for Nuclear Research in Dubna and Lawrence Livermore National Laboratory in California had produced sufficient evidence to claim the discovery of elements 115, 117 and 118.
The body awarded credit for the discovery of element 113, which had also been claimed by the Russians and Americans, to a team of scientists from the Riken institute in Japan.
“IUPAC has now initiated the process of formalising 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).”
The four new elements, all of which are man-made, were discovered by slamming lighter nuclei into each other and tracking the following decay of the radioactive superheavy elements.