Problem: Which of the following exhibit only London (dispersion) forces?a) Heb) HClc) H2Od) Cl2

a) He

 Helium (He) is an element by itself. 

He atom can only exhibit dispersion forces.

b) HCl

H          1A                   1 × 1 e^– = 1 e^–

Cl         7A                   1 × 7 e^– = 7 e^–

   Total: 8 valence e^–