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6 Jan 1940 Jahr - Francio y Astato
Beschreibung:
En 1939 y 1940 se descubrieron los elementos número 87 (francio) y número 85 (as-tato)
Zugefügt zum Band der Zeit:
Historia de la Química
By
Daniel Martinez Alzate
21 Feb 2019
0
0
759
Datum:
6 Jan 1940 Jahr
Jetzt
~ 85 years ago
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