The Bohr model, proposed by Niels Bohr in 1913, describes the atom as a small, dense nucleus surrounded by electrons in circular orbits. This model marked a significant step in the development of atomic physics. 📌📌 Key Postulates 1. Atomic Structure: The atom consists of a small, dense nucleus containing protons and neutrons, surrounded by electrons in circular orbits. 2. Energy Levels: Electrons occupy specific energy levels (or shells) around the nucleus, each corresponding to a fixed energy