We have to explain why elements of group 3A do not show a smooth decrease in ionization energy going doing the group.
Ionization energy is the minimum amount of energy required to remove a single electron from the valence shell of a gaseous atom.
The amount of energy required to remove an electron depends upon how strongly the electron is attracted towards the nucleus.
Unlike the elements in groups 1A and 2A, those in group 3A do not show a smooth decrease in first ionization energy in going down the column. Explain the irregularities.
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