Interaction Type

Example
Average Strength, kcal/mol (kJ/mol) Range**
Charge-charge (ionic)

 
 5 (20) [in water solution] 1/r
Charge-dipole

 
  1/r2
Dipole-dipole

 
   1/r3
Charge-induced dipole

 
   
Dipole-induced dipole*

 
0.1-0.2 (0.4-4)  1/r6
Dispersion*

 

0.1-0.2 (0.4-4)
1/r6
Hydrogen bond

 
3-8 (12-30)  

 van der Waals repulsion
    1/r12

 

Last modified 5 September 2008