With Glenn T. Seaborg's 1945 discovery that the actinides were in fact f-block rather than d-block elements, a recognisably modern form of the table was reached. The periodic table and law are now a ...

Synthesized more than 100 atomic isotopes. Identified the actinide concept which led to the current arrangement of the actinoid series in the periodic table. While involved in the Manhattan Project, ...

There are nine of them, including the newly manufactured berkelium. Four have filled gaps in the periodic table of 92 elements and five have extended it beyond uranium ...