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Why is line spectra also regarded as the 'finger prints of atoms' ?
Verified Answer
Why is line spectra also regarded as the 'finger prints of atoms' ?
Spectral lines are formed by electrons jumping between different energy levels in the atoms.
Electrons can absorb and emit energy only in certain discrete amounts. When an electron absorbs a photon of light with just the right amount of energy, it jumps to a higher energy level. When the electron spontaneously jumps back to a lower energy level, a photon is emitted. Enough electrons jumping between any two given energy levels of a given element will result in a spectral emission or absorption line at a characteristic wavelength.
Spectral lines are used to identify the element and thus, it is called fingerprint of elements.
Different atoms will have the different spectral lines. Just like two different persons have different finger prints.

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Most Upvoted Answer
Why is line spectra also regarded as the 'finger prints of atoms' ?
Each element has a unique line emission spectrum. The characteristic lines in atomic spectra can be used in chemical analysis to identify unknown atoms in the same way as finger prints are used to identify people. Hence it is called fingerprint spectrum.
Community Answer
Why is line spectra also regarded as the 'finger prints of atoms' ?
The emission or absorption spectrum of a particular atom has a characteristic wavelength. line spectra is used to identify elements and thus is called 'fingerprints of atoms ' different atoms have different spectral lines. It's used to identify unknown elements.
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Why is line spectra also regarded as the 'finger prints of atoms' ?
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