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

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryClassification of Elements and Periodicity in Properties1 Mark
MCQ
Ionization energy is highest in _______.
  • A
    [Ne]3s1
  • B
    [Ne]3s23p3
  • C
    [Ne]3d104s24p3
  • D
    [Ne]3s23p4
✓

Answer

  1. [Ne]3s23p3

Explanation:

[Ne]3s23p3 has the highest ionisation energy because along the period ionisation energy increases (as effective nuclear charge increases).

It has a half-filled 3p sublevel which is more stable than a partially filled sublevel in [Ne]3s23p4, sulphur. This is why phosphorus has higher first ionization energy than sulphur.

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