What are the trends of shielding effect in group and period?Justify.
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10
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In general, ionization energy increases across a period and decreases down a group. Across a period, effective nuclear charge increases as electron shielding remains constant.
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when moving to right period, the number of electron increase and streanth of shielding increases as a result , it is easier for valence shell electron to ionize , and thus ionization energy decreases down a group . electron shielding is also known as screening.
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