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Trends in First ionization energy of group 1 and period 4 elements

Trends in Ionization energy of Group 1 elements and Their Analysis 1) As we move down Group 1 (Elements are H, Li, Na, K, Rb, Cs, Fr) the general trend in first ionization energies is that they decrease as we move down the group from H to Cs. Francium is an exception. 2) As we move down Group 1, Ionization energies decrease because a) Distance between the Nucleus and the valence electrons increases with every new period; a new electron shell is added. This increases the atomic size which makes the valence electrons more further from the nucleus. This decreases the attraction between the nucleus and the valence electrons. b) Since there are more filled inner shells now, these provide…