Question: What is the primary postulate of Bohr\'s model of the atom?

Options:

1. Electrons move in fixed orbits around the nucleus
2. Electrons are located in a cloud around the nucleus
3. Nucleus contains protons and neutrons only
4. Electrons can exist anywhere in the atom

Correct Answer: Electrons move in fixed orbits around the nucleus

Solution:

Bohr\'s model states that electrons move in fixed orbits with quantized energy levels around the nucleus.