give two point of difference groups of modern periodic table and periods of modern periodic table
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groups have same electronic configuration.groups have similar chemical properties .For Ex:-lithium,Sodium,Potassium react vigoursly with other Non-Metals.
periods they don't have same configuration.Each Element in a period have different properties For Ex:- Lithium and Flourine are in a same period but one is a highly reactive metal while other is a highly reactive Non -metal.
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