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6.4 Electronic Structure of Atoms (Electron Configurations) – Chemistry
What is the electron configuration for helium? | Socratic
Helium Element in Periodic table (Info + Why not in group 2)
How Many Valence Electrons Does Helium (He) Have? [Valency of He]
helium | Definition, Properties, Uses, & Facts | Britannica
WebElements Periodic Table » Helium » properties of free atoms
6.9: Electron Configurations & the Periodic Table - Chemistry LibreTexts