Why do neon signs glow?
Spectroscopy studies how matter emits, absorbs or scatters electromagnetic radiation as a function of wavelength, frequency or energy.
The short answer
Spectroscopy studies how matter emits, absorbs or scatters electromagnetic radiation as a function of wavelength, frequency or energy.
What is really happening?
Spectroscopy studies how matter emits, absorbs or scatters electromagnetic radiation as a function of wavelength, frequency or energy.
Spectra act like structured fingerprints: their lines and bands reveal energy levels, composition and molecular structure.
Electron configuration describes how electrons occupy available atomic states. This arrangement is central to periodic trends and helps explain why elements in the same group often react in related ways.
A useful mental picture
An electric discharge excites atoms. When electrons return to lower-energy states, atoms emit photons at characteristic wavelengths, producing a recognizable spectrum.