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22 ago 1947 ano - Promecio

Descrição:

Se rellenó el último hueco, el correspondiente al elemento número 61 (promecio).

Adicionado na linha do tempo:

Historia de la Química

ByDaniel Martinez Alzate
21 fev 2019
0
0
678

Data:

22 ago 1947 ano
Agora
~ 77 years ago
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