Which model can be described as negatively charged electrons orbiting a positively charged nucleus in definite paths?

Here are the answers to Exercise 3.13: 1. Which model can be described as negatively charged electrons orbiting a positively charged nucleus in definite paths? a. The Bohr Model. 2. The circular paths in which electrons revolve are called orbits or shells. 3. On what basis did Bohr propose his atomic model? Bohr proposed his atomic model based on Planck's quantum theory and the observed line spectra of hydrogen. He aimed to overcome the drawbacks of Rutherford's model, specifically the instability of the atom and its inability to explain discrete atomic spectra. 4. What are the orbits and why are they called stationary orbits? Orbits are specific, fixed circular paths around the nucleus in which electrons revolve. Each orbit corresponds to a definite energy level. They are called stationary orbits because, as long as an electron remains in a particular orbit, it does not radiate or lose energy. Its energy remains constant. 5. Explain Bohr's Atomic Model. Bohr's Atomic Model proposes that: Electrons revolve around the nucleus in specific, fixed circular paths called orbits or shells, each associated with a definite energy level. As long as an electron remains in a particular orbit, it does not radiate energy; these are called stationary orbits. Electrons can move from a lower energy orbit to a higher energy orbit by absorbing a specific amount of energy, or from a higher energy orbit to a lower energy orbit by emitting energy in the form of radiation. The angular momentum of an electron in a given orbit is quantized, meaning it can only take on certain discrete values.