Glenn Seaborg reordered the Periodic Table- put the actinide series below the lanthanide series. (9 h 26 min, 1 janv. 1940 ans – 0 h 3 min, 31 déc. 1940 ans)
Description:
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.
Ajouté au bande de temps:
Date:
9 h 26 min, 1 janv. 1940 ans
0 h 3 min, 31 déc. 1940 ans
~ 12 months