Question

The increasing order of the atomic radii of the following elements is:
A. $C$
B. $O$
C. $F$
D. $Cl$
E. $Br$

• A. $B<C<D<A<E$
• B. $C<B<A<D<E$
• C. $A<B<C<D<E$
• D. $D<C<B<A<E$

Answer 1

The correct option is A $B<C<D<A<E$

Across the period size decreases.
$\therefore C>O>N>F$
Down the group size increases.
$\therefore Br>Cl>F$

Change in size down the group is much more significant as compared to across the period.
So, the overall order of radius of elements is: $Br>Cl>C>O>F$