It is the first element of the actinide series.
The actinide series derives its name from the group 3 element actinium.
In 1945, he went against the advice of colleagues and proposed a significant change to Mendeleev's table: the actinide series.
The actinide series is the 15 chemical elements between actinium and lawrencium on the periodic table.
The actinide series is named after actinium.
It is a member of the actinide series.
In the periodic table of the elements, it is a period 7 d-block element and the last element of the actinide series.
It was the final and the heaviest element of the actinide series to be synthesized.
A radioactive metal, neptunium is the first transuranic element, and belongs to the actinide series.
Uranium is a silvery-white metallic chemical element in the actinide series of the periodic table, with symbol U and atomic number 92.
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