Then in 1869, a Russian scientist called Dmitri Mendeleev produced one of the first practical periodic tables ... in the middle of the table is called the Transition Metals.

Meyer was just four years older than Mendeleev, and produced several Periodic Tables between 1864-1870. His first table contained just 28 elements, organised by their valency (how many other atoms ...

Many of the pioneers of nuclear physics and chemistry feature in the list of heavy, radioactive elements discovered ... To judge from where they seemed to sit in the periodic table, the elements after ...