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The origin of atomic spectrum lies in the quantized nature of electronic energy levels in atoms. When an atom absorbs energy, its electrons are excited from a lower energy level to a higher one. Upon returning to the ground or lower states, the electrons release energy in the form of electromagnetic radiation. Since the energy levels of atoms are discrete and well-defined, the emitted ____ _____ ________ _________ _______ _________ __________ _________ ___ _______ ________ _____.
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