Latest blog post: End of the chapter 5, and a short hiatus (2024-02-19)
Interesting. Our scientists, or their scientists?
Tangentially related, I had a ttrpg setting once where the deep lore was that fantastical metals like mythril and orichalcum did fall on the periodic table; they were particular isotopes of normal elements which attracted/manifested particles of magic, which radically changed their material properties.
Element Zero! The mass effect! And of course it’s magenta — the color that doesn’t physically exist and is our brain throwing an error.
Speaking of no analog on the periodic table. Scientists did spectrographic analysis on the suspected “dark matter ring” around a number of galaxies (you know, the theorized extra ring of invisible matter that allows galaxies to rotate at the speed they do, which is impossible with observed data). A scan of dozens of galaxies revealed spectral lines that are previously unknown! Exciting stuff.
Dark matter is "dark" because it doesn't interact with electromagnetic energy. It doesn't absorb light (which would produce absorption lines in spectra) or emit light (which would produce emission lines in spectra). The spectrographic analysis of dark matter rings appears to be looking for photons (units of electromagnetic energy) that might be decay (annihilation, breakdown) products of dark matter, specifically high-energy gamma rays.
Nitpick: we think dark matter doesn't interact with electromagnetism. A few theories predict that it's just garden-variety dark.
Most of those still don't predict it to produce spectral lines, though, since they mostly talk about non-atomic, exotic forms of mass, like strangelets or tiny black holes.