Which of the following groups of elements loses an electron most easily?

Generally,the first ionization energy increases along a period. But there are some exceptions. One which is not an exception is

The first ionization enthalpies of four consecutive elements present in the second period of the periodic table are $8.3, 11.3, 14.5$ and $13.6 \ eV,$ respectively. Which one of the following is the first ionization enthalpy of nitrogen?

The ionisation potentials of $Li$ and $K$ are $5.4 \ eV$ and $4.3 \ eV$ respectively. The ionisation potential of $Na$ will be ................ $eV$.

With reference to the concept of ionisation potential,which one of the following sets is correct?

Which elements in a period have the maximum and minimum ionization enthalpy?