File:Hackh's PT (1918).png

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Summary

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

Licensing

Public domain

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.

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