What is the main difference between the Bohr model and the electron cloud model of the atom.

It is used to describe where electrons are when they go around the nucleus of an atom. The electron cloud model is different from the older Bohr atomic model by Niels Bohr. Bohr talked about electrons orbiting the nucleus.

In the Bohr model, an electron’s position is known precisely because it orbits the nucleus in a fixed path.

In the electron cloud model, the electron’s position cannot be known precisely. Only its probable location can be known.