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🎯 High school (second 2nd year course) ✅ Distribution of electrons by shells and subshells (1s, 2s, 2p, 3s, 3p) ✅ Electronic procession of the atom ✅ Methodology for determining the electronic procession and the valence electrons of an atom On the same topic: ▶️ ELECTRONIC CONFIGURATION and position in the periodic table Physics-Chemistry (high school) • ELECTRONIC CONFIGURATION and posi... ▶️ Electronic configuration of a noble gas Second Exercise • Electronic configuration of a gas n... 📑 Extract from the official program (second): The electronic procession of the atom Electronic configuration (1s, 2s, 2p, 3s, 3p) Determine the valence electrons of an atom (for Z less than or equal to 18)