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

Which of the following represents the incorrect order of ionic size?

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:

Which element has a larger atomic size compared to oxygen $(O)$?

Describe the theory associated with the radius of an atom as it:
$(a)$ gains an electron
$(b)$ loses an electron

Which of the following elements has the maximum atomic radius?