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6 янв 1940 г. - Francio y Astato
Описание:
En 1939 y 1940 se descubrieron los elementos número 87 (francio) y número 85 (as-tato)
Добавлено на ленту времени:
Historia de la Química
By
Daniel Martinez Alzate
21 фев 2019
0
0
765
Дата:
6 янв 1940 г.
Сейчас
~ 85 г назад
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