Ionisation energy

Ionisation energy

1. Distance from nucleus

   • if outer electron further from nucleus- less nuclear attraction: ionisation energy required will be less

2. Nuclear charge

   • if the # of protons increases, attraction of nucleus on outer electrons will be greater- more ionisation energy will be needed

3. Electron shielding effect

   • Inner shells of electrons repel the outer ones- the more inner shells the larger the shielding effect- weaker attraction between nucleus and outer electrons= less IE will b needed