The increasing order of the atomic radii of the following elements is
$a. C, b. O, c. F, d. Cl, e. Br$

The correct order of the atomic radii of $C, Cs, Al$ and $S$ is

Which of the following is the correct order of increasing size for the given species?

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$:
Assertion $A$: The ionic radii of $O^{2-}$ and $Mg^{2+}$ are same.
Reason $R$: Both $O^{2-}$ and $Mg^{2+}$ are isoelectronic species.
In the light of the above statements,choose the correct answer from the options given below:

Which of the following has the largest ionic radius?

The size of the species $Pb$,$Pb^{2+}$,and $Pb^{4+}$ decreases as: