Permanent dipole-dipole interactions
If you compare fluorine molecules F-F with H-Cl molecules, the molecules have the same shape and number of electrons.
Fluorine molecules are non-polar and hydrogen chloride molecules are polar.

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Key terms in this lesson
- Dipole
- A separation of opposite partial charges caused by an uneven distribution of the bonding electron pair.
- London forces
- Weak intermolecular forces caused by an instantaneous dipole inducing a dipole in a neighbouring molecule.
More in Shapes and Intermolecular Forces
- More examples.
- Electronegativity
- Bond Polarity
- Polar Solvents and Solubility
- Induced Dipole-Dipole Interactions (London Forces)
- Solubility of Simple Molecules
- Hydrogen Bonds
- Boiling Points of Hydrides and Intermolecular forces
All 13 lessons in Shapes and Intermolecular Forces · All OCR AS-level Chemistry topics