Chemists have waited a long time for a new element to turn up and, now, four have been discovered by researchers in Japan, Russia and the US. The four new elements are the first to be added to the periodic table since 2011, when elements 114 and 116 were included. The new elements, all highly radioactive, complete the seventh row of the periodic table and mean that science textbooks around the world are now out of date.
What is true about the new elements?
They emit a significant amount of radiation They begin the seventh row of the periodic table They behave similarly to elements 114 and 116 They are exist mainly in the form of a gas