What does the wave mechanical model use to represent the locations of electrons?

Circular orbits

Electron clouds

Waves and particles

Answer: Electron clouds

In the the wave mechanical model from the quantum mechanics, the behavior of an electron in an atom is described by an orbital, which is a probability distribution rather than an orbit (represented by a probabilistic cloud).

In this context, electrons are thought of as waves of probabilistic matter using De Broglie's wavelength and Schrödinger's uncertainty principle.