Describe 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 ... These atomic orbitals are not all spheres.

the key difference is certainty of locating electrons in the atom.

Explanation:

Bohr's model treats electron energy levels as clearly defined orbital paths around the nucleus (like planets orbit the Sun).

The cloud model treats the energy levels as probability clouds, i. e. regions in which electrons are likely to be found. The shapes of the clouds are based on the shapes formed by electrons that are trapped like standing waves.