The third ionization energy is maximum for

The element with the highest value of ionization potential is

In the given graph,which point represents an alkali metal with the least atomic number?

Amongst the elements with the following electronic configurations,which one of them may have the highest ionisation energy?

What are the first ionization potentials $(eV)$ of $Be$ and $Ba$ respectively?

Consider the following changes:
$M_{(s)} \to M_{(g)}$ ........$(1)$
$M_{(s)} \to M^{2+}_{(g)} + 2e^-$ .......$(2)$
$M_{(g)} \to M^{+}_{(g)} + e^-$ .........$(3)$
$M^{+}_{(g)} \to M^{2+}_{(g)} + e^-$ .........$(4)$
$M_{(g)} \to M^{2+}_{(g)} + 2e^-$ ..........$(5)$
The second ionization energy of $M$ could be calculated from the energy values associated with: