The emission spectrum of an element is generated when an electron in an atom returns from an excited state to a lower energy state.
Emission spectrum of an element is the range of wavelength emitted by the atom of that element due to heat or electricity.
When an atom or molecule absorbs energy, the atom gets excited into a higher energy state.
However, to remain stable, the atom or molecule has to release the energy and hence, return to the ground state.
Therefore, emission spectrum of an element is generated when an electron in an atom returns from an excited state to a lower energy state.
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