Periodic table's seventh row finally filled as four new elements are added

Discovery of four super-heavy chemical elements by scientists in Russia, America and Japan has been verified by experts and formally added to table

Four new elements have been added to the periodic table, finally completing the table's seventh row and rendering science textbooks around the world instantly out of date.

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.