ionisation energy trends down groups and across periods


	ionisation energy trends down groups and across periods
	Causes DOWN GROUP 2- successive elements have EXTRA and LARGER shells- extra inner electrons will SHEILD outer electrons from attraction of nucleus - and extra shells = outer electrons will be further away from nucleus = ATTRACTION DECREASED ACROSS PERIOD- no of PROTONS INCREASES - stronger nuclear attraction for electrons- extra electrons are in SAME ENERGY LEVEL = same shielding and atomic radius	Effects down group - 1st IE energies DECREASE across period - 1st IE energies INCREASE
	Overall summary DOWN GROUP 2- both causes = easier to remove outer electrons = lower IEACROSS PERIOD- cause and other factors that do not affect IE = increase in IE

DOWN GROUP 2- successive elements have EXTRA and LARGER shells- extra inner electrons will SHEILD outer electrons from attraction of nucleus - and extra shells = outer electrons will be further away from nucleus = ATTRACTION DECREASED
ACROSS PERIOD- no of PROTONS INCREASES - stronger nuclear attraction for electrons- extra electrons are in SAME ENERGY LEVEL = same shielding and atomic radius

DOWN GROUP 2- both causes = easier to remove outer electrons = lower IEACROSS PERIOD- cause and other factors that do not affect IE = increase in IE

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