Explain the deviation in ionisation enthalpy of some elements from the general trend by using Fig. 3.2.

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First ionisation enthalpy increases while moving along a period because as the nuclear charge increases while moving along the period. There is deviation of ionisation enthalpy of some elements from the general trend as shown in figure. The first ionisation enthalpy of B is lower than that of Be due to filled s-orbital in Be and in case of nitrogen, the first ionisation enthalpy is higher than that of O due to half-filled stability.

 

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