Core: Electron Shells

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  • Electron shells
    • rules
      • electrons always occupy shells (energy levels)
      • lowest energy levels filled first - ones closest to the nucleus
      • only a certain number of electrons are allowed in each shell
        • 1st shell: 2
        • 2nd shell: 8
        • 3rd shell: 8
      • atoms happier when they have full outer shells
      • most atoms the outer shell is not full
        • makes atom want to react
    • Rules help to work out electronic configurations
      • example Nitrogen
        • 1 - has seven protons so has seven electrons
        • 2 - first shell can only take 2 electrons and the second shell can take a max of 8 electrons
        • 3 - electronic configuration must be 2.5

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