When atoms are placed in high energy environments, electron is excited to a higher energy level. Emitted energy is difference between the two energy levels. Because only electrons can occupy only certain energy levels, only certain spectral lines are seen. Bohr's Model Similar to solar system. Each orbit assigned an integer, n, known as principle quantum number.
Spectral lines result from movement of atom's electron from an excited state to ground state.
Draw a diagram illustrating the relationship between energy levels and spectral lines. Correlation of Bohr model with spectrum Problems with Bohr model 1. As better spectroscopes became available, scientsts found that line spectra for other atoms contain more lines than could be explained by model. Model could not be used to explain even principal lines in spectra of more complicated atoms. Wavelength of electrons measured in 1927 by Davisson and Germer.