Which of the following has the largest ionic radius?

Which of the following is the correct order of ionic/atomic radius?

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

Given below are two statements $ : $
Statement $(I) :$ The metallic radius of $Al$ is less than that of $Ga$.
Statement $(II) :$ The ionic radius of $Al^{3+}$ is less than that of $Ga^{3+}$.
In the light of the above statements, choose the most appropriate answer from the options given below $ : $

Which of the following ions is the smallest in size?

Arrange the following elements in increasing order of their atomic radius: $Na$,$K$,$Mg$,$Rb$.