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1 янв 1857 г. - Carbon is Tetravalent

Описание:

Friedrich August Kekulé von Stradonitz proposes that carbon is tetravalent, or forms exactly four chemical bonds.

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FINAL - Chemistry Timeline

ByGrace Lackey
11 янв 2018
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1 янв 1857 г.
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~ 167 г назад
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