In the given graph,which point represents an alkali metal with the least atomic number (Period number $= 3$)?

Discuss and compare the trend in ionisation enthalpy of the elements of group-$1$ with those of group-$17$ elements.

Given below are two statements $:$
Statement $(I) :$ The first ionisation enthalpy of group $14$ elements is higher than the corresponding elements of group $13.$
Statement $(II) :$ Melting points and boiling points of group $13$ elements are in general much higher than those of the corresponding elements of group $14.$ In the light of the above statements,choose the most appropriate answer from the options given below $:$

Which is the correct order of the first ionization potential of $N$,$O$,and $C$?

The correct order of ionisation energy of $C$,$N$,$O$,and $F$ is

The ionization potential of sodium is $5.48 \ eV$. The $I.P.$ of potassium is ............. $eV$