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1 янв 1857 г. - August Kekulé propone que el carbono es tetravalente, esto es que forma exactamente cuatro enlaces químicos.

Добавлено на ленту времени:

química

Byraquel
17 окт 2018

Дата:

1 янв 1857 г.
Сейчас
~ 167 г назад
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