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

Which one of the following is the biggest ion?

The order of the magnitude of ionic radii of ions $N^{3-}$,$O^{2-}$,and $F^{-}$ is:

Assertion: The atomic radius of gallium is higher than that of aluminium.
Reason: The presence of additional $d$-electrons offers poor screening effect for the outer electrons from increased nuclear charge.

The ionic radii (in $\mathring{A}$) of $N^{3-}$,$O^{2-}$ and $F^{-}$ are respectively :

The correct order of increasing radius of the elements $Si$,$Al$,$Na$ and $P$ is