Correct increasing order of first ionistion potential is - Vidyadip

Question

Correct increasing order of first ionistion potential is

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Answer

a
As we move across the period, nuclear charge increases, atomic size decreases hence, ionization enthalpy increases. For $Al \left(3 s ^2\, 3 p ^1\right)$, electron has to be removed from partially filled $3 p$ orbital whereas in $Mg \left(3 s ^2\right)$, electron has to be removed from stable fully filled $3 s$ orbital.

Removal of an electron from stable, fully filled orbital requires more energy than removal of electron from partially filled orbital. Thus, ionisation enthalpy for $Mg$ is greater than ionisation enthalpy for $Al$. So, the correct order of first ionization enthalpies is: $Na \,<\, Mg\, >\, Al\, <\, Si$

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