What did Bohr assume about the movement of electrons?

Niels Bohr assumed that electrons move in specific, quantized orbits around the nucleus of an atom, akin to planets orbiting the sun. He proposed that these orbits correspond to distinct energy levels, with electrons able to jump between these levels by absorbing or emitting energy in the form of photons. Bohr's model emphasized that while electrons have defined paths, their exact positions and velocities cannot be simultaneously determined, reflecting an early understanding of quantum mechanics.