File:Hackh's PT (1918).png
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| Description |
English: 9/11 column wide periodic table; Main group 4 is duplicated since it serves as a "transition" group between main groups 1A to 3A and 5A to 7A |
| Date | |
| Source | Hackh IWD (1919), The Classification of the Chemical Elements. Scientific American, 87 (supp 2253), 146–149. doi:10.1038/scientificamerican03081919-146supp |
| Author | Ingo Waldemar Dagobert Hackh |
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This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 70 years or fewer. This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929. |
| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 01:20, 30 June 2023 | | 1,106 × 1,760 (1.34 MB) | Sandbh (talk | contribs) | Uploaded a work by Ingo Waldemar Dagobert Hackh from Hackh IWD (1919), The Classification of the Chemical Elements. Scientific American, 87 (supp 2253), 146–149. doi:10.1038/scientificamerican03081919-146supp with UploadWizard |
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