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  Web Book Home Page | Chemogenesis Main Index Foreword:  Chemogenesis & Chemical Education Part I   Atoms | Elements | Periodic Tables 1.1  Introduction to Chemogenesis 1.2  Nucleosynthesis of The Elements 1.3  The Segrè Chart 1.4  Quantum Numbers to Periodic Tables 1.5  The Periodic Table: What Is It Showing? 1.6  The INTERNET Database of Periodic Tables 1.7  Periodicity Part II   Structure | Bonding | Material Type 2.1  Mono-Bond Typed Binary Compounds 2.2  Binary Compound Synthlet 2.3  Electronegativity 2.4  van Arkel-Ketelaar Triangles of Bonding 2.5  Tetrahedra of Structure, Bonding & Material Type 2.6  Structure, Bonding & Material Synthlet 2.7  The Classification of Matter: Chemical Stuff Part III   Interactions | Reactions | Mechanisms 3.1  The Chemogenesis Analysis: An Overview 3.2  Lewis and Brønsted Models of Acidity 3.3  The Hard Soft [Lewis] Acid Base Principle 3.4  Main Group Elemental Hydrides 3.5  Five Hydrogen Probe Experiments 3.6  Congeneric Dots, Series & Planars 3.7  Quantifying Congeneric Behaviour 3.8  Ligand Replacement Congeneric Series 3.9  Congeneric Array Interactions 3.10  Emergence of Organic Chemistry 3.11  Congeneric Array Database 3.12  The Five Reaction Chemistries 3.13  Lewis Acids & Lewis Bases: A New Analysis 3.14  The Lewis Acid/Base Interaction Matrix 3.15  Patterns in Reaction Chemistry Poster 3.16  Lewis Acid/Base Interaction Matrix Database 3.17  Nucleophiles, Bases & The Fluoride Ion 3.18  Redox Chemistry 3.19  Redox Chemistry Synthlet 3.20  Radical Chemistry 3.21  Diradical Chemistry 3.22  Photochemistry 3.23  Species/Species Interactions 3.24  The Simplest Mechanistic Step: STAD 3.25  Unit & Compound Mechanistic Steps 3.26  The Mechanism Matrix 3.27  Addition To A Double Bond Synthlet 3.28  Pericyclic Reaction Chemistry Part IV   Chemical Theory 4.1  Why Do Chemical Reactions Occur? 4.2a  Thermochemistry: List Reactions Synthlet 4.2b  Thermochemistry: Play With Reaction Synthlet 4.2c  Thermochemistry: Bulid A Reaction Synthlet 4.3  Timeline of Structural Theory 4.4  Modern Lewis Theory 4.5  Valence Shell Electron Pair Repulsion: VSEPR 4.6  Diatomic Species by Molecular Orbital Theory 4.7  Polyatomic Species: Molecular Orbitals 4.8  Organic π-Systems 4.9  Functional Group Database Part V   Complexity & Emergence 5.1  Chemistry & Complexity: Systems 5.2  Linear Chemistry Systems 5.3  Chemical Systems Prone to Complexity Part VI   Extras 6.1  Chemogenesis Videos 6.2  Chemical Thesaurus Reaction Chemistry Database 6.3  Paper: Chemogenesis 6.4  Paper: Electronegativity as a Basic Elemental Property (FoC) 6.5  Workshop: What is Chemistry? 6.6  Paper: Scientific laws, Dalton’s postulates, chemical reactions
          and Wolfram’s NKS (FoC) 6.7  Literature References & Further Reading

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The INTERNET Database of Periodic Tables

There are thousands of periodic tables in web space, but this is the only comprehensive database of periodic tables & periodic system formulations. If you know of an interesting periodic table that is missing, please contact the database curator: Mark R. Leach Ph.D.

Use the drop menus below to search & select from the more than 1300 Period Tables in the database: 

• SEARCH the Database:
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  Formulations 2020 to present day Formulations 2010 – 2019 Formulations 2000 – 2009 Formulations 1950 – 1999 Formulations 1900 – 1949 Formulations 1850 – 1899 Formulations 1800 – 1849 Formulations Before 1800 =================== All Periodic Tables by Date All Periodic Tables by Reverse Date All Periodic Tables, as Added to the Database All Periodic Tables, reverse as Added =================== 2026 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 1976 1975 1974 1973 1972 1971 1970 1969 1968 1967 1966 1965 1964 1963 1962 1961 1960 1959 1958 1957 1956 1955 1954 1953 1952 1951 1950 1949 1948 1947 1946 1945 1944 1943 1942 1941 1940 1939 1938 1937 1936 1935 1934 1933 1932 1931 1930 1929 1928 1927 1926 1925 1924 1923 1922 1921 1920 1919 1918 1917 1916 1915 1914 1913 1912 1911 1910 1909 1908 1907 1906 1905 1904 1903 1902 1901 1900 1899 1898 1897 1896 1895 1894 1893 1892 1891 1890 1889 1888 1887 1886 1885 1884 1883 1882 1881 1880 1879 1878 1877 1876 1875 1874 1873 1872 1871 1870 1869 1868 1867 1866 1865 1864 1863 1862 1861 1860 1859 1858 1857 1856 1855 1854 1853 1852 1851 1850 1844 1843 1842 1838 1836 1831 1830 1829 1825 1824 1817 1814 1813 1811 1808 1807 1804 1803 1802 1801 1800 1798 1794 1791 1789 1787 1783 1782 1781 1778 1775 1774 1772 1771 1766 1753 1751 1748 1735 1718 1700 1690 1687 1682 1671 1669 1624 1617 1520 1000 -300 -450 -800 -1000 -2000 -3500 -3750 -5000 -6000 -7000 -9000
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  Periodic Tables showing Data Spiral & Helical Formulations 3-Dimensional Formulations Miscellaneous Periodic Tables Books & Reviews Non-Chemistry Periodic tables Top 10 Periodic Tables Recently Added Periodic Tables
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  Best Four Periodic Tables for Data All Periodic Tables by Name Elements by Name Elements by Date Discovered Search for: Mendeleev/Mendeléeff Search for: Janet/Left-Step Search for: Eric Scerri Search for: Mark Leach Search for: René Vernon Search for: Electronegativity

Periodic Tables from the year 1866:

Spectroscope Revelations

From Scientific American in 1866, an article by Henry Draper concerning "The Spectroscope and Its Revelations".

At the time there was no understanding how the spectra were generated but it was recognised that every element produced a unique spectrum. Over 35,000 stars are catalogued/identified by their "HD" [Henry Draper] numbers:

Thanks to Eric Scerri for the tip!
See the website EricScerri.com and Eric's Twitter Feed.

Also, thanks to Prof. Emeritus Robert J. Lancashire of The University of the West Indies for corrections & additional information.

Annual Report on the Progress of Chemistry and Related Areas of Other Sciences 1866

Jahresbericht über die Fortschritte der Chemie und verwandter Theile anderer Wissenschaften. (Annual Report on the progress of chemistry and related areas of other sciences.) HathiTrust Index scanned reports 1847-1910.

Mark Leach writes:

"Every year the annual report started with a list of the known chemical elements and their atomic weights, however, to the modern eye there were many systematic errors. For example, oxygen (Sauerstoff) is given as having a weight of 8 which would have caused – due to the importance of oxides – other atomic weights to be out by a factor of 2 or 3. Once a list of correct atomic weights was known, it would be possible to construct a periodic table of the elements.

"In 1858 the Cannazzario letter gave more correct list of atomic weights and corrected the numerous stoichiometric errors that plagued chemistry at the time. Over the years from 1858 to 1873 the entries in the annual report gradually adopted the Cannazzario logic."

Didym D = 48 was actually a mixture of rare earth elements. The missing elements had yet to be discovered.

Thanks to René and Mario Rodriguez for the tip!

© Mark R. Leach Ph.D. 1999 –

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