Representative Visible-Light Emission-Line
Spectra of Various Chemical Elements

Hydrogen (1 electron)

Helium (2 electrons)

Carbon (6 electrons)

Nitrogen (7 electrons)

Oxygen (8 electrons)

Neon (10 electrons)

Argon (18 electrons)

Iron (26 electrons)

Krypton (36 electrons)

Xenon (54 electrons)

Mercury (80 electrons)