Describe the main difference between the bohr model and the electron cloud model of the atom.

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

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.

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.

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