Answer:
A) I (s)
Explanation:
Intermolecular forces are weaker forces of attractions or repulsion that exist between particles (atom or molecules). The intermolecular force of attraction that exist between the halogen family(Florine, Bromine, Chlorine & Iodine) are the van der Waal dispersion forces also known as (london dispersion forces) and they are the weakest force of attraction.
As we move further down the group, there are more greater electrons which move around and these electrons represents and form the temporary dipoles that create these van der Waal dispersion forces.
Another key point concerning the van der Waal dispersion forces is the melting point and the boiling point. Since melting points and boiling point of the halogen family increases down the group because of increase in molecular weight, The stronger the intermolecular force of attraction down the group.
We can therefore conclude that the intermolecular force of attraction is strongest in Iodine I(s) because intermolecular force increases down the group.
