Periodic Table |
 |
 |
 |
 |
 |
 |
 |
| 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).
| Year: 1922 | PT id = 1405, Type = formulation |
Die seltenen Erden im periodischen System (The Rare Earths in the Periodic System)
C. Renz, "Die seltenen Erden im periodischen System," Zeitschrift für anorganische und allgemeine Chemie (ZAAC), 122, 135-45 (Jan., 1922). View the paper (in German) here.
This article addresses the challenge of placing the growing number of known rare earth elements (lanthanides) into the periodic system. Renz discusses how lower members of the rare earth family fit into the third group (Scandium, Yttrium, Lanthanum), while addressing the placement of elements like Cerium. This work was part of the ongoing effort during that era to refine the periodic table to better accommodate the lanthanide series.
"A suggested improvement in Mendeléeff's table, by vertical elongation, gives space to a single vertical column of all the rare-earth elements in group III, family A."
|
|
|
| What is the Periodic Table Showing? | Periodicity |
© Mark R. Leach Ph.D. 1999 –
Queries, Suggestions, Bugs, Errors, Typos...
If you have any:
Queries
Comments
Suggestions
Suggestions for links
Bug, typo or grammatical error reports about this page,please contact Mark R. Leach, the author, using mark@meta-synthesis.com
This free, open access web book is an ongoing project and your input is appreciated.