Which interaction produces dispersive forces by creating temporary dipoles that induce dipoles in other molecules?

This type interaction is called the London dispersion force. These are temporary forces that happens when electrons of two adjacent atoms occupy positions that will result to temporary dipoles. The constant motion of the electrons will cause to form an instantaneous dipole when the electrons are unsymmetrically distributed. These forces are present in nonpolar substances.

Neither model is able to show the reactivity of potassium.