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Ionization Energies

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Question

why is the ionization enthalpy of group 13 less than that of group 2?

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Solution

Group 2 elements have ns² configuration which is a stable configuration. So the energy needed to remove the electron is more. Whereas group 13 has ns²np¹ electrons which are easily removed. Thus the ionisation energy of group 13 is less than that of group 2.

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