Explain trend in why the ionisation energies increase across the period
As we travel along the period the nuclear charge increases, this increases the grip the nuclei of the atom has on the electrons. As they are on the same period they experience almost the exactly the same electron shielding, a result of this is the atomic radii decrease along the period. So a greater nuclear attraction for the outer electrons occurs which means more energy is needed to remove this electron increasing ionisation energy
PJ
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