1 déc. 1940 - Later expansions and the end of the periodic table P2
Description:
In 1940, neptunium and plutonium were the first transuranic elements to be discovered; they were placed in sequence beneath rhenium and osmium, respectively. However investigations of their chemistry suggested a similarity to uranium than to lighter transition metals, challenging their placement in the periodic tableAjouté au bande de temps:
Date:
1 déc. 1940
Maintenaint
~ Il y a 84 ans