Correct increasing order of first ionisation | vedclass

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(A) As we move across the period,nuclear charge increases and atomic size decreases,hence ionisation enthalpy generally increases.For $Al$ $([Ne] 3s^2

Vedclass · Accepted Answer

$Na  Al < Si$

Vedclass · Answer

(A) As we move across the period,nuclear charge increases and atomic size decreases,hence ionisation enthalpy generally increases.For $Al$ $([Ne] 3s^2 3p^1)$,the electron is removed from a partially filled $3p$ orbital,whereas for $Mg$ $([Ne] 3s^2)$,the electron is removed from a stable,fully filled $3s$ orbital.Removal of an electron from a stable,fully filled orbital requires more energy than removal from a partially filled orbital.Therefore,the ionisation enthalpy of $Mg$ is greater than that of $Al$.The correct order of first ionisation enthalpies is: $Na  Al < Si$.

Correct increasing order of first ionisation potential is

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