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Posted

Salut, 

est ce que le 12Mg a des électrons célibataires a son état fondamental ? 

Pour moi il est : 

1s2, 2s2, 2p6, 3s2 --> donc pas d'électrons célibataires

Mais voila l'item : 

6C et 12Mg possèdent tous les deux 2 électrons célibataires.

Vrai 

Merci 

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