Praxis Study Companion – Physics (5266) Practice Test

Bohr’s model pictures the atom as a small nucleus with electrons moving in specific, circular paths around it. These paths are not arbitrary; they are fixed orbits with definite energies, so the electron’s motion isn’t free to be anywhere around the nucleus. In this view, electrons stay in these permitted orbits without radiating energy, and they jump between them only when the atom absorbs or emits a photon whose energy matches the difference between the levels.

This description matches the statement describing electrons moving rapidly around the nucleus in paths called orbits, which is the essence of the Bohr model. It also explains why it’s distinct from the modern electron-cloud view (where electrons are described by probability clouds) and from a picture of a dense nucleus with electrons outside in a loose sense. The key idea is the combination of circular orbits and energy quantization that Bohr introduced to explain atomic spectra.