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CGP EDU Academic Team
Published on: August 14, 2026
The first ionisation enthalpies of Na, Mg, Al and Si are in the order :
Text Solution
Verified by ExpertsThe correct answer is:
A
Across the period (i.e. 3rd period) the size of atom decreases and nuclear charge increases. So generally the ionisation energy increases. However the ionisation energy of Mg is greater than Al because of more penetration power of 2s sub-shell electrons of Mg as compared to that of the 2p sub-shell electron of Al. Also, Mg has fully filled configuration.
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