Niels Bohr"s model of the hydrogen atom, was the primary reason for the understanding of energy levels.Bohr was able to explain the bright line spectrum of hydrogen. Sparked by the recent discovery of the diffraction patterns, scientists believed electrons could be described as waves. Bohr hypothesized that energy is being added to the hydrogen gas in the electricity form, and then leaving the gas in the form of light. He figured the light rays to be quantized, meaning only certain frequencies of the light rays can be seen. In turn, he reasoned that the hydrogen atoms themselves were quantized and,...
the wavelength, the faster the atom can be filled and jump to a higher level.

Bohr developed his theory after studying the work of Einstein"s ideas on the photons of energy. He used these ideas to explain the amount of energy collected in the bright-line spectrum. He then used mathematics to determine the different energy levels of hydrogen. Bohr was able to prove the other spectral lines for hydrogen in the ultraviolet and infrared places of the electromagnetic spectrum. Overall, his model of the hydrogen atom helped to provide an explanation for different energy levels, color formation, and frequencies.