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Valence electron - Wikipedia
开壳层 - 百度百科
1.3: Valence electrons and open valences - Chemistry LibreTexts
Transition metals with closed shells - Chemistry Stack Exchange
2.5: Arrangement of Electron (Shell Model) - Chemistry LibreTexts
3.7: Electrons and Valence Shells - Chemistry LibreTexts
Characteristics and Determination of Valence Electrons - BYJU'S
What are Valence Electrons? (with pictures) - AllTheScience
What are valence electrons and how do you find them?