Atom Structure: Electron Shells

The video explains how the reactivity of elements is determined by the number and arrangement of electrons in their shells. Electrons move around the nucleus in shells, with each shell holding a specific number of electrons. The outer shell's electron count influences an element's reactivity, as atoms seek stability by filling their outer shells. Potassium, with one outer electron, is reactive, while noble gases like neon and argon are stable due to full outer shells.

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