Standard atomic weights, those numbers emblazoned under the elements on the periodic table, were once thought of as unchanging constants of nature. But researchers have tweaked the atomic weights of ...

Physicists have synthesized the element livermorium, which has the atomic number 116, using an unprecedented approach 1 that promises to open the way to new, record-breaking elements. The heaviest ...

AN important result of the development of Moseley's atomic number rule has been the impetus it has given to the search for missing elements. It is true that later arrangements of the Periodic Table ...