Okay, the user wants me to translate "electron-shells" into French. Let me think. The term "electron shells" refers to the energy levels or orbitals in an atom where electrons reside. In French, the equivalent term is "couches électroniques." I should confirm that there isn't a different term used in French scientific literature. A quick check shows that "couches électroniques" is indeed the standard translation. Since the original content isn't in French, I need to provide the translation. The user specified to output only the translation without any explanations, so I'll just write "couches électroniques" as the response.
couches électroniques
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