Question

Do London forces exist in all substances? Explain.

Answer 1

Yes, but they may not be the dominant form of intermolecular interaction....

Explanation:

London dispersion forces arise from transient dipoles that form between electron clouds of adjacent molecules. While these are of fairly insignificant magnitude, they CAN cause condensation if the temperature is fairly low IN THE ABSENCE of stronger intermolecular forces....London forces are conceived to be responsible for the condensation of the Noble gases...

And note that we specify INTERMOLECULAR, not interatomic force.