@cyrilmizzi si tu prends O (Z=8), sa première couche contient 2 atomes (ok), sa deuxième en contient 6 (mais l'idéal serait 8) [...]
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@cyrilmizzi si tu prends O (Z=8), sa première couche contient 2 atomes (ok), sa deuxième en contient 6 (mais l'idéal serait 8) [...]