1.2 Electronic Structure

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  • Electronic Structure
    • Electrons are found in shells surrounding the nucleus of an atom.
      • The first shell holds 2 electrons, and every other one holds up to 8
    • The shells fill up as they move across each period.
      • The 1S subshell fills first follwed by 2S, 2P, 3S, 3P, 4S, 3D, 4P, 5S, 4D, 5P
    • we show the electron configuration in boxes, representing each orbital with a box and the electrons with oppositely rotating arrows
      • When filling the P and D orbitals, we put one electron in each box before we begin pairing up.
  • Copper and Chromium have unique electron configurations.
    • copper is 1S2, 2S2, 2P6, 3S2, 3P6, 4S1, 3D10,
      • The 3D orbital fills as it takes an electron from the 4S orbital to become more stable.
    • Chromium is 1S2, 2S2, 2P6, 3S2, 3P6, 4S1, 3D5
      • It fills the 3D sub-shell by taking an electron from the 4S sub-shell to again become more stable.
    • Electronic Structure
      • Electrons are found in shells surrounding the nucleus of an atom.
        • The first shell holds 2 electrons, and every other one holds up to 8
      • The shells fill up as they move across each period.
        • The 1S subshell fills first follwed by 2S, 2P, 3S, 3P, 4S, 3D, 4P, 5S, 4D, 5P
      • we show the electron configuration in boxes, representing each orbital with a box and the electrons with oppositely rotating arrows
        • When filling the P and D orbitals, we put one electron in each box before we begin pairing up.

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