Identify the element having the smallest atomic radius from the following:

Which of the following has the largest size?

The ionic radius of $Cr$ is minimum in which of the following compounds?

Given below are the pairs of group $13$ elements showing their relation in terms of atomic radius: $(B < Al)$, $(Al < Ga)$, $(Ga < In)$ and $(In < Tl)$. Identify the elements present in the incorrect pair and in that pair,find out the element $(X)$ that has a higher ionic radius $(M^{3+})$ than the other one. The atomic number of the element $(X)$ is:

The atomic radii $(pm)$ of $Al, Si, N$ and $F$ respectively are:

Which of the following represents the correct order of ionic radii?