Question

The electron cloud model is a modern theory about the structure of atoms that explains many of the atom’s behaviors. According to the model, scientists imagine an atom to have a large nucleus of matter in the center surrounded by tiny particles called electrons. These electrons fly so fast and unpredictably around the nucleus that just one electron can appear to be a cloud. However, individual electrons are far too small for a human to see or touch. What is a limitation of the electron cloud model theory that a law about electrons would not have?

Answer 1

Couldn't explain that electrons behaves as both particles and waves.

Answer 2

Answer:        

According to Electron cloud model, there is a negatively charged region in an atom which has probability to find an electron.

According to Bohr's model of atom, electrons reside in fixed shells around the nucleus and never enter it. But it is the limitation of the Electron cloud model that describes that it is probable that electron might be present in the nucleus. The distance is not fixed, sometimes the electron is closer and sometimes it is away.