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

Given below are two statements:
Statement $I$: The metallic radius of $Na$ is $1.86 \ \mathring{A}$ and the ionic radius of $Na^{+}$ is lesser than $1.86 \ \mathring{A}$.
Statement $II$: Ions are always smaller in size than the corresponding elements.
In the light of the above statements,choose the correct answer from the options given below:

Which of the following series correctly represents the relationship between the elements from $X$ to $Y$ $(X \to Y)$?

Arrange the following in increasing order of ionic radii: $O^{2-}, Na^{+}, F^{-}, Mg^{2+}$

$A$ trend common to both groups $I$ and $VII$ elements in the periodic table as atomic number increases is

The correct order of atomic radii of the elements $O$,$N$,$S$ and $P$ is