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NEET2009ChemistryClassification of Elements and Periodicity in PropertiesActual

Amongst the elements with following electronic configurations, which one of them may have the highest ionisation energy ?

Options

  1. A[ Ne ] 3 ~s ^2 3 p ^3
  2. B[ Ne ] 3 ~s ^2 3 p ^2
  3. C[ Ar ] 3 ~d ¹⁰, 4 ~s ^2 4 p ^3
  4. D[ Ne ] 3 ~s ^2 3 p ^1

Correct answer

A. [ Ne ] 3 ~s ^2 3 p ^3

Step-by-step solution

Key Idea Ionisation energy usually increases from left to right in a period with decrease in atomic size and decreases from upto down in a group with increase in atomic size. array lc Electronic configuration & Group [ Ne ] 3 ~s ^2 3 p ^3 & ~V [ Ne ] 3 ~s ^2 3 p ^2 & IV [ Ar ] 3 ~d ¹⁰, 4 ~s ^2, 4 p ^3 & ~V [ Ne ] 3 ~s ^2 3 p ^1 & III array Since IE increases in a period and decreases in a group, [Ne] 3 s^2 3 p ^3 configuration has the highest ionisation energy among the given.

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