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The correct order of first ionization enthalpy is:
A
Mg < Al < Na < Si
B
Mg < Na < Al < Si
C
Na < Mg < Al < Si
D
Na < Al < Mg < Si
Explanation
Generally, ionization enthalpy increases as we move left to right along the period. But first ionization enthalpy of Mg is more than Al because Mg has stable electronic configuration [Ne]3s2 , so it requires more energy to remove the outermost electron from it.
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