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What is the Periodic Table Showing? Periodicity

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. The database holds information on periodic tables, the discovery of the elements, the elucidation of atomic weights and the discovery of atomic structure (and much, much more).

   Use the drop menus or search box (below) to Select or Search the 1400 entries in the database: 

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Periodic Tables from the year 1898 :

1898   Crookes' vis generatrix
1898   Neon, Discovery of
1898   Krypton, Discovery of
1898   Xenon, Discovery of
1898   Polonium, Discovery of
1898   Radium, Discovery of
Year:  1898 PT id = 75, Type = formulation 3D

Crookes' vis generatrix

Model of Crookes’ vis generatrix of 1898, built by his assistant, Gardiner. From: Proc. R. Soc. Lond. 63, 408.

The vertical scale represents the atomic weight of the elements from H = 1 to Ur = 239.

Missing elements are represented by a white circle. Similar elements appear underneath each other:

Cutting Board

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Year:  1898 PT id = 789, Type = element

Discovery of Neon

Ne

Neon, atomic number 10, has a mass of 20.18 au.

Neon is a noble gas. It is present in the atmosphere, 1 part in 65000.

Neon was first isolated in 1898 by W. Ramsay and W. Travers.

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Year:  1898 PT id = 816, Type = element

Discovery of Krypton

Kr

Krypton, atomic number 36, has a mass of 83.798 au.

Krypton is a noble gas.

Krypton was first isolated in 1898 by W. Ramsay and W. Travers.

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Year:  1898 PT id = 834, Type = element

Discovery of Xenon

Xe

Xenon, atomic number 54, has a mass of 131.293 au.

Xenon is a noble gas.

Xenon was first isolated in 1898 by W. Ramsay and W. Travers.

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Year:  1898 PT id = 864, Type = element

Discovery of Polonium

Po

Polonium, atomic number 84, has a mass of 209 au.

Radioactive element.

Polonium was first observed or predicted in 1898 by P. and M. Curie and first isolated in 1902 by W. Marckwald.

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Year:  1898 PT id = 868, Type = element

Discovery of Radium

Ra

Radium, atomic number 88, has a mass of 226 au.

Radioactive element.

Radium was first observed or predicted in 1898 by P. and M. Curie and first isolated in 1902 by M. Curie.

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What is the Periodic Table Showing? Periodicity

© Mark R. Leach Ph.D. 1999 –

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