Which statement below does NOT follow the Bohr model?

• A. Electrons occupy fixed orbits around the nucleus with quantized energies.
• B. The energy of each orbit is proportional to n^2, where n is the principal quantum number.
• C. Electrons can exist anywhere around the nucleus without restriction to specific energy levels.
• D. Electrons can emit or absorb energy only when transitioning between allowed energy levels.

Answer: (C)

Verified step by step guidance

1. Step 1: Recall the main postulates of the Bohr model, which describe electrons as occupying fixed orbits (energy levels) around the nucleus with quantized energies.
2. Step 2: Understand that in the Bohr model, the energy of each orbit is inversely proportional to the square of the principal quantum number \(n\), meaning \(E_n \propto -\frac{1}{n^2}\), not proportional to \(n^2\).
3. Step 3: Recognize that electrons can only emit or absorb energy when they transition between these fixed energy levels, which is a key feature of the Bohr model.
4. Step 4: Identify the statement that contradicts the Bohr model: the idea that electrons can exist anywhere around the nucleus without restriction to specific energy levels is inconsistent with the quantized orbits concept.
5. Step 5: Conclude that the incorrect statement is the one claiming electrons can exist anywhere around the nucleus without restriction to specific energy levels, as this does not follow the Bohr model.