When an atom is modeled using the Bohr model, which of the following is assumed about the electrons?

• A. Electrons are distributed randomly throughout the atom.
• B. Electrons move in fixed circular orbits around the nucleus.
• C. Electrons are located only at the nucleus.
• D. Electrons have no defined energy levels.

Answer: (B)

Verified step by step guidance

1. Understand that the Bohr model is an early atomic model that describes electrons as moving in specific paths around the nucleus.
2. Recall that in the Bohr model, electrons are not randomly distributed or located at the nucleus; instead, they occupy fixed energy levels.
3. Recognize that these fixed energy levels correspond to circular orbits where electrons move with quantized energies.
4. Note that the Bohr model assumes electrons have defined energy levels, which means they cannot exist between these orbits.
5. Therefore, the key assumption is that electrons move in fixed circular orbits around the nucleus, each orbit corresponding to a specific energy level.