InterviewSolution
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InterviewSolution
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Electron gain enthalpy is greater than zero forA. `Na`B. `Mg`C. `A1`D. `Sn` |
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Answer» Correct Answer - B The outermost shell electron configuration of the alkaline earth metals is `ns^(@)`. For the process `M(g) +e^(-)rarr M^(-)(g)` where `M` denotes a member of group `2` family, the extra electron must enter the `np` subshell, which is effectively shielded by the two `ns` electron (the `np` electrons are farther away from the nucleus than the `ns` eletrons) and the inner electrons. consequently, alkaline earth metals such as `Mg` have no natural tendecy to pick up an extra electrons as they from unstable anions. An atom that forms an ustable anion on addition of an eletron has a positive value of `Delta_(eg)H`. |
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