ionisation energy patterns across a period and down a group
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4 Terms
general increase across period
increased nuclear charge causes increased force of attraction…atomic radii and shielding effect remains constant
rapid decrease in IE between first and last element in two periods
decreased force of attraction caused by increased atomic radii and shielding effect…these two factors outweigh increased nuclear charge
slight decrease between beryllium and boron
less attraction between fifth electron in boron and nucleus due to slight increase in atomic radii and shielding effect…these two factors outweigh increased nuclear charge
decreased IE down a group
less attraction due to increased atomic radii and shielding by complete inner shells…these two factors outweigh increased nuclear charge
Note 
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