Glenn Seaborg reordered the Periodic Table- put the actinide series below the lanthanide series. (9 ore 26 min, 1 gen 1940 anni – 0 ore 3 min, 31 dic 1940 anni)

Descrizione:

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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