The first ionisation enthalpies of Na, Mg, A l and Si are in the order:

Chemistry · JEE Advanced · NTA Exams — Classification of Elements and Periodicity in Properties

1. Na < Mg > Al < Si
2. Na > Mg > Al > Si
3. Na < Mg < Al < Si
4. Na > Mg > Al < Si

Answer

(A) Na A l < Si

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