successive ionisation energies show shell structure

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  • Created by: albanora4
  • Created on: 16-01-17 18:24

successive ionisation energies show shell structure

CausesGetting Started

  • Within each shell, successive ionisation energies increase
  • (within each shell means shells getting closer to nucleus)

Effects

  • WHY? because electrons are being removed from an INCREASINGLY positive ion and there is less REPULSION amongst remaining electrons
  • BIG JUMPS in ionisation energy happen when each new shell is broken into
  • why does the above happen? an electron is being removed from a shell closer to nucleus

Overall summary

EXAMPLE: successive ionisation energies of Na 1 electron in 3rd shell - low IE energy (only weakly attracted to nucleus)8 electrons in 2nd shell - medium IE energy (IE increasing closer to nucleus- more strongly attracted to it)2 electrons in first shell - it is the shell closest to nucleus - strongest attraction

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