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Valence electron - Wikipedia
Transition metals with closed shells - Chemistry Stack Exchange
Electron configuration - Wikipedia
6.8: Electron Configurations - Chemistry LibreTexts
Nuclear shell model - Wikipedia
What does a closed shell mean? + Example - Socratic
What are some examples of a closed shell? + Example - Socratic
3.7: Electrons and Valence Shells - Chemistry LibreTexts
8: Periodic Properties of the Elements - Chemistry LibreTexts
Octet Rule: Definition, Explanation, Exceptions And Examples