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  4. The increasing order of the first ionisation enthalpies of the elements B, P, S and F (lowest first) is

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Q. The increasing order of the first ionisation enthalpies of the elements B, P, S and F (lowest first) is

Classification of Elements and Periodicity in Properties

Solution:

In general as we move from left to right in a period, the ionisation enthalpy increases with increasing atomic number. The ionisation enthalpy decreases as we move down a group. P$\left(1s^{2}2s^{2}2p^{6}3s^{2}3p^{3}\right)$ has a stable half filled electronic configuration hence, its ionisation enthalpy is higher than that of S.
$\therefore \,$ Increasing order of ionization energy is
$B<\,S<\,P<\,F.$