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  4. Which group of elements shows lowest ionisation enthalpy?

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Q. Which group of elements shows lowest ionisation enthalpy?

Classification of Elements and Periodicity in Properties

Solution:

Group 1 elements show the lowest ionization enthalpy as they are biggest in the given period and it has the lowest effective nuclear charge than the rest elements of the period. It further decreases as we move down the group. Thus Alkali metals have lowest IE.