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AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
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1 janv. 1857 - August Kekulé propone que el carbono es tetravalente, esto es que forma exactamente cuatro enlaces químicos.
Ajouté au bande de temps:
química
By
raquel
17 oct. 2018
0
0
499
Date:
1 janv. 1857
Maintenaint
~ Il y a 168 ans
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