Question

scientists made the following two observations about emission spectra: each element has a unique emission spectrum. atoms emit energy only at specific wavelengths. describe how the bohr model explains both of these observations.

Explanation:

In the Bohr model, electrons occupy fixed - energy orbits. When an electron transitions from a higher - energy orbit to a lower - energy orbit, it emits a photon with energy equal to the energy difference between the two orbits. Since each element has a unique set of electron energy levels, the energy differences (and thus the wavelengths of emitted photons) are unique for each element, explaining the unique emission spectra. Also, because electrons can only occupy discrete energy levels, the energy emissions occur only at specific wavelengths corresponding to the energy differences between these levels.

Answer:

The Bohr model posits electrons in fixed energy orbits. Transitions between these orbits release photons with energies corresponding to the energy differences of the orbits. Each element's unique energy - level structure gives a unique emission spectrum, and the discrete nature of the energy levels results in emissions at specific wavelengths.