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  1. 开壳层 - 百度百科

  2. Valence electron - Wikipedia

  3. Transition metals with closed shells - Chemistry Stack Exchange

  4. 3.7: Electrons and Valence Shells - Chemistry LibreTexts

  5. 1.3: Valence electrons and open valences - Chemistry LibreTexts

  6. 3.8: Electron Configurations and the Periodic Table

  7. Valence Electrons - Chemistry - Socratic

  8. Characteristics and Determination of Valence Electrons - BYJU'S

  9. What does a closed shell mean? + Example - Socratic