The $3^{rd}$ ionisation energy amongst $Li$,$Be$,$B$ and $C$ is lowest for

The first four $I.E.$ values of an element are $284, 412, 656$ and $3210 \ kJ \ mol^{-1}$. The number of valence electrons in the element are

In a group of elements,as the atomic number increases,which of the following is $NOT$ observed?

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 $:$

$A$ sudden large jump between the values of second and third ionisation energies of an element would be associated with the electronic configuration:

The electronic configuration with the highest ionization enthalpy is