Heaviest elements yet join periodic table

 作者:文五     |      日期:2019-03-07 08:03:06
By David Shiga THE periodic table has put on weight. Its newest members, ununquadium and ununhexium, are the heaviest elements yet confirmed, with 114 and 116 protons apiece. Though they both exist for less than a second before decaying, they are a step towards the fabled “island of stability” in the periodic table – a group of even heavier, but stable elements. Evidence for the two elements has been mounting for years. They were finally given official status last week, after a three-year review by the Joint Working Party on Discovery of Elements,