Which of the following gaseous atoms has the highest value of $IE$?

The value of ionization energy of noble gases is ......... .

The correct increasing order of ionisation enthalpy of $He, Li^{+}, Be^{2+}$ is

When the first ionization energies are plotted against atomic number,the peaks are occupied by:

The values of $\Delta _iH_1, \Delta _iH_2, \Delta _iH_3$,and $\Delta _iH_4$ for an atom are $7.5 \ eV, 25.6 \ eV, 48.6 \ eV$,and $170.6 \ eV$ respectively. Determine the electronic configuration of the atom.

The first ionization energy of alkaline earth metals is higher than that of alkali metals. This is due to...