Students, I want to remind you about an electron in the ground state and excited state.An electron of an atom, from the ground state position can move to the high energy level, if there is an absorption of photon. The energy of this electron will increase and energy level will also increase, higher than before. This electron move to the high energy level, the next level. In this new position, we call as an excited state. However, this electron is not stable, because the energy immediately release from the electron. At the same time, this electron go back to the initial level, that is the ground state position. The energy changes become a spectrum.
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