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AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
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6 jan 1940 ano - Francio y Astato
Descrição:
En 1939 y 1940 se descubrieron los elementos número 87 (francio) y número 85 (as-tato)
Adicionado na linha do tempo:
Historia de la Química
By
Daniel Martinez Alzate
21 fev 2019
0
0
763
Data:
6 jan 1940 ano
Agora
~ 85 years ago
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