Which statement about Niels Bohr's atomic model is true?

• A. Electrons occupy fixed energy levels and can move between them by absorbing or emitting energy.
• B. Bohr's model explains the behavior of all elements, including those with more than one electron.
• C. Electrons move randomly around the nucleus without any defined energy levels.
• D. The model describes electrons as waves spread throughout the atom.

Answer: (A)

Verified step by step guidance

1. Understand that Niels Bohr's atomic model was an early quantum model developed to explain the behavior of electrons in atoms, particularly hydrogen.
2. Recall that Bohr proposed electrons orbit the nucleus in specific, fixed energy levels or shells, rather than moving randomly.
3. Recognize that electrons can move between these fixed energy levels by absorbing or emitting a quantum of energy, which corresponds to the difference between the energy levels.
4. Note that Bohr's model successfully explained the spectral lines of hydrogen but does not accurately describe atoms with more than one electron.
5. Understand that the description of electrons as waves spread throughout the atom is part of the later quantum mechanical model, not Bohr's model.