Spectral lines are produced when an electron jumps from one energy level to another within an atom

• The nucleus of an atom is surrounded by electrons that occupy only certain orbits or energy levels

• When an electron jumps from one energy level to another, it emits or absorbs a photon of appropriate energy (and hence of a specific wavelength).

• The spectral lines of a particular element correspond to the various electron transitions between energy levels in atoms of that element.

• Bohr’s model of the atom correctly predicts the wavelengths of hydrogen’s spectral lines.