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  1. Valence electron - Wikipedia

  2. Transition metals with closed shells - Chemistry Stack Exchange

  3. Electron configuration - Wikipedia

  4. 6.8: Electron Configurations - Chemistry LibreTexts

  5. Nuclear shell model - Wikipedia

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

  7. What are some examples of a closed shell? + Example - Socratic

  8. 3.7: Electrons and Valence Shells - Chemistry LibreTexts

  9. 8: Periodic Properties of the Elements - Chemistry LibreTexts

  10. Octet Rule: Definition, Explanation, Exceptions And Examples