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  4. The correct decreasing order of first ionisation enthalpies of five elements of the second period is

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Q. The correct decreasing order of first ionisation enthalpies of five elements of the second period is

Classification of Elements and Periodicity in Properties

Solution:

As we move along the period, the nuclear charge increases and size of atom decreases. Therefore, it is more difficult to remove electron from an atom. Hence the sequence of first ionization enthalpy in decreasing order is
$F>\, N>\, C\quad$
But ionization enthalpy of boron is less as compared to beryllium because first electron in boron is to be removed from p-orbital while in beryllium, is to be removed from s-orbital. More energy is required to remove electron from s-orbital as compared to p-orbital.