Where does a spectrum come from?
"Excite electrons fall back to lower energy levels releasing energy in the form of light."
Exciting an electron promotes it to a higher sublevel of energy level.
When they return to the ground state energy is given off.
Since each element has different numbers of protons, neutrons and most importantly electrons, the emission spectrum for each element is different. Is can be used to identify an element in mixtures.
More spectrum of selected elements.
These individual lines represent specific amounts of energy that was released as an electron transitions to a lower energy level.