How does the atomic radius change across a period in the periodic table?

Which one of the following is the smallest in size?

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

The ionic radii of $F^{-}$ and $O^{2-}$ respectively are $1.33 \ \mathring{A}$ and $1.40 \ \mathring{A}$,while the covalent radius of $N$ is $0.74 \ \mathring{A}$. The correct statement for the ionic radius of $N^{3-}$ from the following is:

Which group elements have the smallest atomic radii in their respective periods?

Which one of the following indicates the correct order of atomic size?