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AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
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1 jan 1857 ano - August Kekulé propone que el carbono es tetravalente, esto es que forma exactamente cuatro enlaces químicos.
Adicionado na linha do tempo:
química
By
raquel
17 out 2018
0
0
499
Data:
1 jan 1857 ano
Agora
~ 168 years ago
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