How do electrons move according to the Bohr Model?

The Bohr Model of the atom, proposed by Niels Bohr in 1913, describes electrons as moving in fixed energy levels or orbits around the nucleus. According to this model, each electron's orbit corresponds to a specific energy state, and the electrons can only exist in these quantized levels without radiating energy.

This means that an electron in a fixed energy level will not lose energy and spiral into the nucleus, as classical physics would suggest. Instead, an electron can only transition between these energy levels by absorbing or emitting a specific amount of energy, which results in changes to its state. This concept of quantized orbits and fixed energy levels was revolutionary and laid the groundwork for the development of quantum mechanics, which later modified these ideas to explain the behavior of electrons in a more complex way.

The other choices either misrepresent the structured nature of electron movement prescribed by Bohr or reflect concepts from later theories that build upon the foundational ideas put forward by Bohr. The emphasis on fixed energy levels directly aligns with the essence of the Bohr Model's contribution to atomic theory.