5 Forgotten Periodic Tables and Why We Only Use 1

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 150 years ago! Join Michael Aranda in this new episode of SciShow and learn all about them! SciShow has a spinoff podcast! It s called SciShow Tangents. Check it out at http://www.scishowtangents.org ---------- Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow ---------- Huge thanks go to the following Patreon supporters for helping us keep SciShow free for everyone forever: Adam Brainard, Greg, Alex Hackman, Sam Lutfi, D.A. Noe, الخليفي سلطان, Piya Shedden, KatieMarie Magnone, Scott Satovsky Jr, Charles Southerland, Patrick D. Ashmore, charles george, Kevin Bealer, Chris Peters ---------- Sources: https://iupac.org/what-we-do/ https://www.nde-ed.org/EducationResources/HighSchool/Electricity/valenceshell.htm http://www.chem.tamu.edu/class/fyp/stone/tutorialnotefiles/fundamentals/trends.htm https://periodic.lanl.gov/about.shtml https://www.angelo.edu/faculty/kboudrea/periodic/trends_atomicradius.htm http://www.unesco.org/new/en/brasilia/about-this-office/prizes-and-celebrations/2019-international-year-of-the-periodic-table-of-chemical-elements/ https://www.bipm.org/utils/common/pdf/si_brochure_8_en.pdf http://scienceline.ucsb.edu/getkey.php?key=408 http://www.rsc.org/periodic-table/history/about https://phys.org/news/2019-01-periodic-table.html https://forvo.com/word/alexandre-%C3%A9mile_b%C3%A9guyer_de_chancourtois/ https://www.meta-synthesis.com/webbook/35_pt/pt_database.php?PT_id=7 http://scienceworld.wolfram.com/biography/BeguyerdeChancourtois.html https://digital.sciencehistory.org/works/s4655h20t https://www.meta-synthesis.com/webbook/35_pt/JCE_PTs_1934.pdf https://www.meta-synthesis.com/webbook/35_pt/pt_database.php?PT_id=33 https://patents.google.com/patent/US3581409A/en https://www.meta-synthesis.com/webbook/35_pt/pt_database.php?PT_id=21 https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Electronic_Structure_of_Atoms_and_Molecules/Electronic_Configurations/Electronic_Configurations_Intro http://www.ipgp.fr/~tarantola/Files/Professional/Mendeleev/ https://www.sciencedaily.com/terms/electron_configuration.htm https://web.archive.org/web/20160323155930/http://chemed.chem.purdue.edu/genchem/history/dobereiner.html http://philsci-archive.pitt.edu/3095/ https://link.springer.com/article/10.1007/s10698-008-9062-5 http://www.chem.tamu.edu/class/fyp/stone/tutorialnotefiles/fundamentals/trends.htm https://www.researchgate.net/publication/36444683_What_if_the_periodic_table_starts_and_ends_with_triads https://www.khanacademy.org/partner-content/big-history-project/stars-and-elements/knowing-stars-elements/a/dmitri-mendeleev https://www.britannica.com/science/atomic-weight https://www.quora.com/Why-was-the-spiral-arrangement-of-the-periodic-table-proposed Image Sources: https://commons.wikimedia.org/wiki/File:Periodic_Table_of_Elements_showing_Electron_Shells_(2011_version).svg https://commons.wikimedia.org/wiki/File:Comparative_atomic_sizes.png https://commons.wikimedia.org/wiki/File:Gallium_crystals.jpg https://commons.wikimedia.org/wiki/File:Elementspiral_(polyatomic).svg https://commons.wikimedia.org/wiki/File:Periodic_system_Alexander_format.svg https://commons.wikimedia.org/wiki/File:Portrait_de_Charles_Janet_vers_1925.jpg https://commons.wikimedia.org/wiki/File:Eric_Scerri.tif https://digital.sciencehistory.org/works/s4655h20t https://commons.wikimedia.org/wiki/File:DIMendeleevCab.jpg https://commons.wikimedia.org/wiki/File:Mendelejevs_periodiska_system_1871.png https://commons.wikimedia.org/wiki/File:Mendeleev%27s_periodic_table_(1869).svg https://commons.wikimedia.org/wiki/File:Alexandre-Emile_B%C3%A9guyer_de_Chancourtois.jpg https://commons.wikimedia.org/wiki/File:Telluric_screw_of_De_Chancourtois.gif https://commons.wikimedia.org/wiki/File:Benfey,_Theodor_(1809-1881).jpg https://commons.wikimedia.org/wiki/File:P2x.png https://commons.wikimedia.org/wiki/File:P2M0.png https://commons.wikimedia.org/wiki/File:P2y.png https://commons.wikimedia.org/wiki/File:D3xy.png https://commons.wikimedia.org/wiki/File:D3xz.png https://commons.wikimedia.org/wiki/File:D3M0.png https://commons.wikimedia.org/wiki/File:D3yz.png https://commons.wikimedia.org/wiki/File:D3x2-y2.png https://commons.wikimedia.org/wiki/File:F4y(3x2-y2).png https://commons.wikimedia.org/wiki/File:F4z(x2-y2).png https://commons.wikimedia.org/wiki/File:F4yz2.png https://commons.wikimedia.org/wiki/File:F4M0.png https://commons.wikimedia.org/wiki/File:F4xz2.png https://commons.wikimedia.org/wiki/File:F4xyz.png https://commons.wikimedia.org/wiki/File:F4x(x2-3y2).png https://commons.wikimedia.org/wiki/File:Dmitri_Mendeleev_1890s.jpg