What visual model is used to represent the structure of atoms, resembling planets orbiting the sun?

The Bohr Model is a visual representation of atomic structure that depicts electrons orbiting the nucleus in defined paths, similar to how planets orbit the sun. This model was proposed by Niels Bohr in 1913 to address shortcomings in earlier models of the atom.

In the Bohr Model, the nucleus is at the center, containing protons and neutrons, and the electrons are found in circular orbits around the nucleus. Each orbit corresponds to a specific energy level, and electrons can move between these energy levels by absorbing or emitting energy in the form of photons. This model effectively illustrates the quantized nature of electron energy levels, which is a critical concept in understanding atomic structure.

Other models, such as the Quantum Model and the Electron Cloud Model, provide more complex and accurate depictions of electron behavior in terms of probability distributions rather than fixed orbits. The Nuclear Model primarily focuses on the nucleus and does not adequately represent the arrangement of electrons around it. Thus, among the options presented, the Bohr Model best fits the description of a structure resembling planets orbiting the sun.