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3. Classification of elements and periodicity in properties — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistry3. Classification of elements and periodicity in properties1 Mark
MCQ
Amongst the following elements, the highest ionization energy is
  • A
    $[Ne]\,3s^2\,3p^1$
  • ✓
    $[Ne]\,3s^2\,3p^3$
  • C
    $[Ne] \,3s^2\,3p^2$
  • D
    $[Ar]\,3d^{10} \,4s^2\, 4p^3$
✓

Answer

Correct option: B.
$[Ne]\,3s^2\,3p^3$
b
The IE increases along a period and decreases down the group. Also, IE of 15 is more than group 16 as group 15 has half-filled p subshell giving extra stability.

Thus among given option highest IE is of option B i.e. $[N e] 3 s^{2} 3 p^{3}$.

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