As the number of electrons increase and more energy levels are available, there is the possibility of a greater number of transitions.
What is a spectrum?
According to the Bohr model of the atom, electrons can be moved from the point of a higher energy level to that of a lower energy level. When this occurs, there is an emission of light of a characteristic wavelength. This is shown as a line in the spectrum of the atom.
If we look at the spectrum as it has been shown, we will notice that the number of the spectral line increased as the value of the principal quantum number and the number of electrons increased. This is because, as the number of electrons increase and more energy levels are available, there is the possibility of a greater number of transitions.
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