Problem: 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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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.

  • Electrons closer to the nucleus are difficult to remove because of stronger attraction.

 

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Problem Details

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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