The radii of $F$,$F^{-}$,$O$ and $O^{2-}$ are in the order of:

Assertion $(A)$: $Mg^{2+}$ and $Al^{3+}$ are isoelectronic but the magnitude of the ionic radius of $Al^{3+}$ is less than that of $Mg^{2+}$.
Reason $(R)$: The effective nuclear charge on the outermost electrons in $Al^{3+}$ is greater than that in $Mg^{2+}$.
The correct option among the following is:

Identify the correct order in which the covalent radius of the following elements increases: $(I) \ Ti, (II) \ Ca, (III) \ Sc$.

When a neutral atom is converted into a cation,there is:

The correct order of atomic radii of $B, Be, N$ and $C$ is

The increasing order of the atomic radius of $Si, S, Na, Mg, Al$ is