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Additional
actinide concept
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Actinide concept
The
actinide concept
in nuclear chemistry was first theorized by
Glenn T. Seaborg
in 1944, resulting in the extension of
Dmitri Mendeleev
's
periodic table of the elements
by placing a new
actinide series
, for elements 89–103, below the
lanthanide series
. In later theoretical work, Seaborg proposed the
transactinide
series spanning elements 104–121 and the
superactinide
series containing elements 122–153.
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