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Classification of Elements and Periodicity in Properties — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryClassification of Elements and Periodicity in Properties1 Mark
MCQ
Alkaline earth $($group $2$ or $\ce{IIA}$ elements) differ from group $12 \ ($or $\ce{IIB})$ elements in the electronic configuration of their :
  • A
    Anitipenultimate shell
  • B
    Innermost shell
  • C
    Outermost shell
  • ✓
    Penultimate shell
✓

Answer

Correct option: D.
Penultimate shell
Electronic configuration Alkaline earth $($group $2$ or $\ce{IIA}$ elements$)$ is $\ce{ns}^2$
Electronic configuration group $12\ ($or $\text{IIB})$ elements is $\ce{ns^2,(n−1)d^{10}}$,
so these twogroups differ in their electronic configaration of penultimate shell.

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