what element shows less ionisation enthalpy
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Aluminum is the first element of its period with electrons in the 3p shell. This makes the first ionization energy comparably low to the other elements in the same period, because it only has to get rid of one electron to make a stable 3s shell, the new valence electron shell
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Sulphur has the maximum atomic radius when compared to the other three atoms. Also the electronic configuration of sulphur is [Ne]3s23p4. By losing one electron, sulphur can attain the half filled state and hence achieve greater stability. Hence, sulphur has the least ionization enthalpy in this case.
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