Arrange the elements N,P,O and S in the order of increasing first ionisation enthalpy. Give reason for the arrangement assigned. - Chemistry

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Short Note

Arrange the elements \[\ce{N, P, O}\] and \[\ce{S}\] in the order of increasing first ionisation enthalpy. Give reason for the arrangement assigned.

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Solution

\[\ce{S < P < O < N}\]

Ionisation enthalpy increases from left to right in a period and decreases down the group. N has higher ionisation enthalpy than \[\ce{O}\] due to extra stability of half-filled orbitals. Similarly, \[\ce{P}\] has higher ionisation enthalpy than S due to half-filled orbitals.

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Chapter 3: Classification of Elements and Periodicity in Properties - Multiple Choice Questions (Type - I) [Page 33]

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NCERT Exemplar Chemistry Class 11
Chapter 3 Classification of Elements and Periodicity in Properties
Multiple Choice Questions (Type - I) | Q 37.(i) | Page 33

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