Bohr theories are a set of principles that describe the behavior of electrons in an atom. There are several synonyms for the term "Bohr theories," including the Bohr model, the Bohr theory of atomic structure, and the Bohr atomic model. These theories were proposed by Danish physicist Niels Bohr in 1913, and they revolutionized atomic theory by providing a way to understand the behavior of electrons in an atom. The Bohr model is based on the idea that electrons occupy specific energy levels around the atomic nucleus, and that they move between these levels by absorbing or emitting energy. Today, the Bohr model is still taught in many science classrooms as a foundational principle of atomic theory.