The successive ionisation energies (starting from the $1^{st}$) of an element are $801$,$2430$,$3660$,$25000$,and $32800 \ kJ \ mol^{-1}$,respectively. The element is:

The first,second and third ionisation energies ($E_1, E_2$ and $E_3$) for an element are $7 \ eV$,$12.5 \ eV$ and $42.5 \ eV$ respectively. The most stable oxidation state of the element will be

Which of the following represents the correct order of increasing first ionization enthalpy for $Ca, Ba, S, Se$ and $Ar$?

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

The second ionization potential of elements is invariably higher than the first ionization potential because:

Which of the following elements has the highest first ionization enthalpy?