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Le chrome et l’oxygène peuvent former 2 espèces : l’ion chromate et le trioxyde de
chrome.
a. Ecrivez les formules de Lewis de ces 2 espèces.
b. Donnez-en les formes limites.
c. Donnez le nombre d’électrons de valence de chacune des espèces.
d. En utilisant la littérature scientifique, comparez les longueurs de liaisons Cr-O dans
les 2 espèces.
e. Montrez que la somme des charges formelles est égale à la charge de chacune des
espèces.


Sagot :

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