ionisation energy across period 3

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  • first ionisation energies across period 3
    • general increase
      • increae in nuclear charge no increased shielding
      • atomic radius decreasing
        • outer elctron closer to nucleus with greater nuclear charge so more enrgy required to remove it
          • increae in nuclear charge no increased shielding
  • Na
    • Mg
      • Al
        • Si
          • P
            • S
              • Cl
                • Ar
                  • group 0 elements have highest ionisation energy
                    • smallest atomic radius and high nuclear charge
              • group 6 has a lower than expected ionisation energy
                • pairing of electrons in the p subshell
                  • Untitled
        • group 3 elements show lower than expected first ionisation energy
          • division of the energy level into sub-shells. Al has electron configuration 1s2,2s2,2p6,3s2,3p1. 3p1 electron is further from the nuclues and has addition shielding from the inner 3s2 inner elctrons
    • group 1 elements have the lowest first ionisation energy in every period
      • greates atomic radius and the lowest nuclear charge

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