Okay, the user wants me to translate "electron-shells" into Persian. Let me check if the term is already in Persian. Since it's an English term, I need to translate it. The correct translation for "electron shells" in Persian is "لایههای الکترون". I should make sure there's no existing Persian content here. The user provided "electron-shells" which is in English, so the translation is needed. I'll output just the translation without any explanations as per the rules.
لایههای الکترون
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