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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
The set representing the correct order of first ionisation potential is :
  • A
    $\ce{K > Na > Li}$
  • ✓
    $\ce{Be > Mg > Ca}$
  • C
    $\ce{B > C > N}$
  • D
    $\ce{Ge > Si > C}$
✓

Answer

Correct option: B.
$\ce{Be > Mg > Ca}$
Size increases as we move down the group.
Therefore, the outer electrons experience less attraction due to increase in distance,
i.e., the effective nuclear charge experienced is less. Less the effective nuclear charge less the $\ce{I.P}.$

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