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Which of the following relation is correct with respect first (I) and second (II) ionisation of sodius and magnesium?A. `I_(mg)=II_(Na)`B. `I_(Na)gtI_(Mg)`C. `II_(Mg)gtII_(Na)`D. `II_(Na)gtII_(Mg)`

Answer» Correct Answer - A
Due to the large size of group `IA` elements, the outermost electron is far from the nucleus and can easily be removed. Their ionisation eneries or ionisation potentials are relatively low.
Ionisation potential `(eV) = {:(Li,Na,K,Rb,Cs),(5.4,5.1,4.3,4.2,3.9):}`.


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