5 Periodic Tables We Don't Use and Why

You probably studied the "regular" periodic table in school—but did you know there are more versions of the periodic table than just the one you know? The periodic table of elements has gone through many iterations since it was first used to organize elements over 150 years ago! Join Michael Aranda in this new episode of SciShow and learn all about them!

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Sources:
https://iupac.org/what-we-do/
https://www.nde-ed.org/EducationResou...
http://www.chem.tamu.edu/class/fyp/st...
https://periodic.lanl.gov/about.shtml
https://www.angelo.edu/faculty/kboudr...
http://www.unesco.org/new/en/brasilia...
https://www.bipm.org/utils/common/pdf...
http://scienceline.ucsb.edu/getkey.ph...
http://www.rsc.org/periodic-table/his...
https://phys.org/news/2019-01-periodi...
https://forvo.com/word/alexandre-%C3%...
https://www.meta-synthesis.com/webboo...
http://scienceworld.wolfram.com/biogr...
https://digital.sciencehistory.org/wo...
https://www.meta-synthesis.com/webboo...
https://www.meta-synthesis.com/webboo...
https://patents.google.com/patent/US3...
https://www.meta-synthesis.com/webboo...
https://chem.libretexts.org/Bookshelv...
http://www.ipgp.fr/~tarantola/Files/P...
https://www.sciencedaily.com/terms/el...
https://web.archive.org/web/201603231...
http://philsci-archive.pitt.edu/3095/
https://link.springer.com/article/10....
http://www.chem.tamu.edu/class/fyp/st...
https://www.researchgate.net/publicat...
https://www.khanacademy.org/partner-c...
https://www.britannica.com/science/at...
https://www.quora.com/Why-was-the-spi...

Image Sources:
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://digital.sciencehistory.org/wo...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...