Here's why:

* Electrons: Electrons are negatively charged particles that orbit the nucleus.

* Cloud: They don't follow a fixed path like planets around a sun. Instead, they exist in a region of probability called the electron cloud. This cloud represents the area where you are most likely to find an electron.

* Orbitals: Within the electron cloud, electrons occupy specific energy levels and shapes called orbitals.

So, while we often picture electrons orbiting the nucleus like planets, the reality is a bit more complex. It's better to imagine a diffuse cloud of negatively charged particles surrounding the nucleus.