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1 ene 1940 año - At

Descripción:

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

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ByМаргарита

12 nov 2018

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1 ene 1940 año

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~ 85 years ago

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