There are two main areas of an atom, the electron cloud and the nucleus
First, let's talk about the atom's nucleus. The nucleus is in the middle of the atom. The nucleus contains neutrons (particles with no charge) and protons (positively charged protons). The number of protons is constant in every atom of the same element, meanwhile the number of neutrons is not. The atomic number of an element describes the amount of protons in a atom of that same element and it is fixed.
The electron cloud, on the other hand, is a predicted zone that's used to roughly estimate where the electrons are within the atom. Electrons are said to have no fixed orbit.
I don't want to get too in depth and make you confused so I hope this helped!