Glenn Seaborg reordered the Periodic Table- put the actinide series below the lanthanide series. (9 St. 26 Min, 1 Jan 1940 Jahr – 0 St. 3 Min, 31 Dez 1940 Jahr)
Beschreibung:
Actinide- Atomic numbers from 89-103. 15 elements, named after Actinium, first element in series. Used in nuclear reactors and bombs.
Lanthanide- Atomic numbers from 57-71. 15 metals, rare earth elements. Silvery-white metals, similar to Lanthanum, first element in group. Found naturally on Earth.
"Inner Transition Elements". Rare elements listed at bottom of Periodic Table.
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History of the Periodic Table
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