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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 Properties3 Marks
Question
Explain the deviation in ionisation enthalpy of some elements from the general trend by using.
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Answer

Ionisation enthalpy increases in a period with increase in atomic number. The graph shows few exceptions and not the linear relationship. Ionisation enthalpy of Be is greater than that of B due to filled s-orbital in Be (Be-l.s2 1s2, B-1s2 2s2 2p1).
Ionisation enthalpy of N is greater than that of O due to half-filled p-orbitals in nitrogen. 
(N-1s2 2s2 2p3, O-1s2 2s2 2p4).

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