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Why care about spectra?  |  Don't spectra all look the same?  |  How can you tell them apart?

If the emission lines of the chemical elements were observed through a diffraction grating, they would look something like this (dynamic image - may take a moment to load):

Emission spectra of the elements
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Note the only gap in the above image should be astatine (At). If you see any other missing spectra, please go into the interactive viewer and click on the missing element(s).

High Resolution Version

Periodic table format

and Photographic Periodic Table

Interactive Viewer
and heat map


Runs entirely in browser - no download, no risk.

Due to occasional updates to the data, you may notice variances in the table above vs. the high res version v. the interactive version. When in doubt, the interactive version is always the most up to date.

This image is based on spectrum line positions and intensities from MIT Wavelength Tables (1938) and the NIST Atomic Spectrum Database. Most of the spectra have had intensity corrections applied in order to match actual spectrum photos of samples of each element.

Astatine is missing from this image as no visible lines of this element are known. Lines of francium have been extrapolated from known energy levels.

Disclaimer: Spectra that have not been photographed might not look exactly like the image above. Some spectra may deviate considerably from the depictions pictured here. We have photographed as many element spectra as possible in order to confirm the line intensities of the source data. For most of the actinides, only a few bright lines are known, but the actual spectra should be about as complex as their corresponding lanthanides, we just don't have data for most of the lines. Spectra that have been photographed do for certain look like the image above. Spectra not yet photographed or not sufficient quality image include: B, F, P, S, Cl, Se, Br, Rb, Tc, Cs, Pm, Po, Rn, Fr, Ra, and all of the actinides except U. All of these spectra should be treated as suspect in the image above.

All images of spectra on this website are Public Domain or CC0, unless otherwise noted.

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