Assumptions
The Drude model considers the metal to be formed of a mass of positively-charged ions from which a number of "free electrons" were detached. These may be thought to have become delocalized when the valence levels of the atom came in contact with the potential of the other atoms.
Notwithstanding the origin of such free electrons from the contact of different potentials, the Drude model neglects any long-range interaction between the electron and the ions and assumes that the electrons do not interfere with each other. The only possible interaction is the instantaneous collision between a free electron and an ion, which happens with a fixed probability per unit time.
The Drude model is a purely classical model and treats both electrons and ions as solid spheres.
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