Element having highest $I.P.$ value is

Elements $X, Y$ and $Z$ have atomic numbers $19, 37$ and $55$ respectively. Which of the following statements is true about them?

Which of the following electronic configurations represents a sudden large gap between the values of second and third ionisation energies of an element?

The correct trend in the first ionization enthalpies of the elements in the $3^{rd}$ period of periodic table is:

Which of the following orders of ionization energy is correct?

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: