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开壳层 - 百度百科
Valence electron - Wikipedia
Transition metals with closed shells - Chemistry Stack Exchange
3.7: Electrons and Valence Shells - Chemistry LibreTexts
1.3: Valence electrons and open valences - Chemistry LibreTexts
3.8: Electron Configurations and the Periodic Table
Valence Electrons - Chemistry - Socratic
Characteristics and Determination of Valence Electrons - BYJU'S
What does a closed shell mean? + Example - Socratic