What is periodicity?
Periodicity is the trend in chemical and physical properties of the elements across each period of the periodic table.All elements in a period have the same number of shells, all elements in a group have the same number of electrons in their outer shells.Atomic radius decreases across a period and ionisation energy increases.However, there is a drop in ionisation energy between groups 2&3 and 5&6
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The equilibrium N2O4 (g) -->--< 2NO2 (g) is set up when N2O4 dissociates. When 0.0370 moles of N2O4 dissociates at 25 degrees in a 0.5dm3 sealed container, 0.0310 moles of N2O4 remains at equilibrium. Calculate the value of Kc for this reaction.