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1 jan 1940 ano - At

Descrição:

Астат
открыли Дэйл Раймонд Корсон, Эмилио Джино Сегре и Кеннет Росс Маккензи

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12 nov 2018

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Data:

1 jan 1940 ano

Agora

~ 85 years ago

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