| धातु | $Li$ | $Na$ | $K$ | $Rb$ | $Cs$ |
| रंग | क्रिमसन लाल | पीला | बैंगनी | लाल-बैंगनी | नीला |
| $\lambda / nm$ | $670.8$ | $589.2$ | $766.5$ | $780.0$ | $455.5$ |
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