The first four ionization energy values of an element are $191$,$578$,$872$ and $5962 \ kcal$. The number of valence electrons in the element is

The correct order of second $I.E.$ of $C$,$N$,$O$,and $F$ is:

The correct order of $IE_2$ is

Which of the following statements is wrong?

First and second ionization enthalpies of lithium are $520 \text{ kJ mol}^{-1}$ and $7297 \text{ kJ mol}^{-1}$ respectively. Energy required to convert $3.5 \text{ mg}$ lithium $(g)$ into $Li^{2+}(g)$ [$Li(g) \rightarrow Li^{2+}(g)$] is . . . . . . $\text{kJ}$. (nearest integer) [Molar mass of $Li = 7 \text{ g mol}^{-1}$]

What do the processes $(i) X_{(g)} \to X^+_{(g)} + e^-$ and $(ii) X^+_{(g)} \to X^{2+}_{(g)} + e^-$ represent?