What are quantized orbits?

Quantized orbits refer to the concept in quantum mechanics where electrons in an atom can only occupy certain discrete energy levels or orbits around the nucleus. This idea was famously introduced in the Bohr model of the atom, which proposed that electrons exist in specific stable orbits without radiating energy. Transitions between these quantized states involve the absorption or emission of energy in the form of photons. Thus, quantized orbits explain the stability of atoms and the emission spectra observed in elements.