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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 1100 Period Tables in the database:

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Periodic Table formulations from the year 1886:

1886   Crookes' Periodic Table
1886   Discovery of Fluorine
1886   Discovery of Germanium
1886   Discovery of Dysprosium
1886   Shepard's Natural Classification
1886   Reynolds' Method of Illustrating the Periodic Law


Crookes' Periodic Table

From Quam & Quam's 1934 review paper.pdf

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Discovery of Fluorine


Fluorine, atomic number 9, has a mass of 18.998 au.

Fluorine exists as a pale yellow diatomic molecular gas, F2. It is the most electronegative and reactive of all elements: it which reacts with practically all organic and inorganic substances.

Fluorine was first observed or predicted in 1810 by A.-M. Ampére and first isolated in 1886 by H. Moissan.

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Discovery of Germanium


Germanium, atomic number 32, has a mass of 72.63 au.

Germanium was first isolated in 1886 by C. A. Winkler.

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Discovery of Dysprosium


Dysprosium, atomic number 66, has a mass of 162.5 au.

Dysprosium was first isolated in 1886 by P.E.L. de Boisbaudran.

Chronology of chemically the splitting of yttria (mixed oxides) into the pure rare-earth metals:

From: CRC Handbook on the Physics and Chemistry of Rare Earths, Chapter 248. Accommodation of the Rare Earths in the Periodic Table: A Historical Analysis
by Pieter Thyssen and Koen Binnemans (ISBN: 978-0-444-53590-0)

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Shepard's Natural Classification

Shepard's Natural Classification of the Elements, a spiral formulation with instructions for turning it into a three-dimensional table.

From: Elements of Inorganic Chemistry, Descriptive and Qualitative (pp221), by J. H. Shepard, (1886), Boston MA, pub. D. C. Heath

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Reynolds' Method of Illustrating the Periodic Law

Reynolds, J. E. (1886). Note on a method of illustrating the periodic law. Chemical News, 54, 1–4

Ann E. Robinson comments:

"Reynolds published a zig-zag version he created, noting it had been 'used in my lecture-room for some years in order to illustrate the periodic character of the relation between the atomic weights and properties of the chemical elements.'

>"Rather than a tabular form, Reynolds's form was a curve, best visualised as a string with seven knots tied in it at regular intervals, providing a 'vibrating system'. Although Reynolds's diagram is presented only as a two-dimensional picture, in a note he remarks that a friend suggested that the installation of 'a vibrating metallic chain, suspended from the ceiling and attached to the floor, would afford a more complete picture.'":

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What is the Periodic Table Showing? Periodicity

© Mark R. Leach Ph.D. 1999 –

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