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(A) The ionization enthalpy $(IE)$ is highest for noble gases due to their stable electronic configuration. Therefore,the $IE$ of $Ar$ and $He$ is hig

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$He$

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(A) The ionization enthalpy $(IE)$ is highest for noble gases due to their stable electronic configuration. Therefore,the $IE$ of $Ar$ and $He$ is higher than that of the halogens $Cl$ and $I$. Down a group,$IE$ decreases due to an increase in atomic size. Comparing $He$ and $Ar$,$He$ has a smaller atomic size,so $IE$ of $He > Ar$. Across a period,$IE$ increases with an increase in atomic number. Comparing $Cl$ and $Ar$,$Ar$ has a higher $IE$ than $Cl$. Thus,the overall order of ionization enthalpy is $I Therefore,$He$ has the highest ionization enthalpy.

Which of the following elements has the highest value of first ionization enthalpy $(\Delta_i H_1)$?

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