Respuesta :
Mono-electronic hydrogen has many spectral lines because, despite having only one electron, hydrogen atoms have many shells. As a result, when a single electron jumps from one shell to another, a photon is released, and the energy difference between the shells causes the photon to have a variety of wavelengths.
As the electrons fall from higher levels to lower levels, they release photons. Different "falls" create different colors of light. A larger transition releases higher energy (short wavelength) light, while smaller transitions release lower energies (longer wavelength).The visible wavelengths are caused a by single electron making the different transitions. There are even more transitions that release invisible wavelengths.
Though a hydrogen atom has only one electron, it contains a large number of shells, so when this single electron jumps from one shell to another, a photon is emitted, and the energy difference of the shells causes different wavelengths to be released... hence, mono-electronic hydrogen has many spectral lines.
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