Are all man-made elements metals
The periodic table is officially four elements richer
Iupac has officially recognized the repeated evidence of four other chemical elements. The new additions to the periodic table of the elements do not yet have a name.
As of December 30, 2015, the seventh row of the periodic table of the elements is complete. Because on this day the International Union for Pure and Applied Chemistry (Iupac) announced that the repeated detection of the elements with the ordinal numbers 113, 115, 117 and 118 is now considered confirmed. These are the first additions to the Periodic Table of the Elements since 2011, when the elements 114 and 116, Flerovium and Livermorium, were recognized by Iupac.
The long way to the periodic table
Extending the periodic table is a complicated business. It is not enough that a new chemical element has been detected once, but at least two independent experimental proofs are required. Iupac (as the authority that decides on nomenclature, symbols and standardized measuring methods in chemistry) is then responsible for checking the data collected by various research groups before deciding on the inclusion of the new element in the periodic table. The team of scientists who made the discovery first can then suggest a name for the newly discovered chemical element. Until then, the elements have temporary «placeholder names», which are based on the respective ordinal number. For the time being, element 113 is still called Ununtrium, elements 115, 117 and 118 are called Ununpentium, Ununseptium and Ununoctium analogously.
"Baptism" for the first time in Asia
At Ununtrium, the honor of choosing a name goes to the scientists at the Riken Research Center in Japan. Ununtrium will be the first element to be named in Asia. A consortium of American and Russian researchers can propose the names of the other three newcomers. Scientists from the Lawrence Livermore National Laboratory in California, the Oak Ridge National Laboratory in Tennessee (both USA) and the Joint Institute for Nuclear Research in Dubna, Russia, were involved in the discoveries.
All four new elements do not occur naturally, but are created when lighter atomic nuclei collide in accelerators. They are all unstable and disintegrate within fractions of a second.
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