Compare the first () and second () ionization enthalpies of alkali (Group 1) and alkaline earth (Gro — s Block Elements Chemistry Question
Question
Compare the first ($IE_1$) and second ($IE_2$) ionization enthalpies of alkali (Group 1) and alkaline earth (Group 2) metals of the same period.
Answer: B
💡 Solution & Explanation
$IE_1$ of Group 2 is greater than Group 1 due to smaller atomic size and a stable fully filled $ns^2$ orbital. However, $IE_2$ of Group 1 is extremely high as the second electron is removed from a stable noble gas core, making $IE_2$ of Group 1 greater than $IE_2$ of Group 2.
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