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Periodic Table and Periodicity question

2009 · Q112
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Periodic Table and Periodicity question

2009 · Q112

NEETChemistryPeriodic Table and PeriodicityMCQ+4 / −1
Amongst the elements with following electronic configurations, which one of them may have the highest ionisation energy ?
  1. A
    Ne [3s2 3p2]
  2. B
    Ar [3d10 4s2 4p3]
  3. C
    Ne [3s2 3p1]
  4. D
    Ne [3s2 3p3]
View written solutionFree

Correct answer: D

Among the given options (a), (c) and (d), the option (d) has the highest ionisation energy because of extra stability associated with half-filled 3p-orbital. In option (b), the presence of 3d10 electrons offers shielding effect, as a result the 4p3 electrons do not experience much nuclear charge and hence the electrons can be removed easily.

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