Respuesta :
The answer is D.
The nucleus is in the middle, which eliminates A and B. The electron cloud is what surrounds the nucleus, so it cannot be C. So, D is the correct answer.
Hope I helped! : )
Answer:
The viewer travels through the electron cloud, then the nucleus, and then the electron cloud again.
Explanation:
The animation makes it seem as if the viewer passes all the way through the atom, starting from one side, then through the atom's center, and then leaving through the other side.
The center of the atom is called the nucleus. It is made up of neurons and protons. The nucleus is surrounded by electrons. Therefore, the animations would start with the electrons, go through the center of the atom or the nucleus, and then finish again with the electrons on the other side.