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CGP EDU Academic Team
Published on: August 13, 2026
The first ionization enthalpies of Na, Mg, Al and Si are in the order.
Text Solution
Verified by ExpertsThe correct answer is:
A
As we move across the period, atomic size decreases hence, ionization enthalpy increases. But for Al 
, electron has to be removed from outer 3p orbital ehereas in Mg 
, electron has to be removed from stable fully filled 3s orbital. Thus, I.E. for Mg > Al. So, the correct order of first ionization enthalpies is: Na < Mg > Al < Si.
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