PAST AND PRESENT ARRANGERS OF CHEMICAL ELEMENT SYSTEMS
Three independent PowerPoints highlight a personage-oriented history of the development of element concepts and illustrations from ancient history leading to the current operative periodic tables for study and professional use.
Having the students understand the need for order (and how to attain it) in a knowledge presentation is the core purpose of the Randomized to Organized lesson plan.
These PowerPoints are designed to provide additional aid to the teacher who wishes to help students understand the process of arriving at the first periodic table, the minds and methods of improving on it in many ways, and the probability that the process is incomplete even now. NGSS, and particularly Crosscutting, is particularly well related to the historic backstory, creative genius', and technology of the later builders of periodic tables.
Science: Chemistry, scientific methods, parts of atom, etc.
Technology: Moseley: spectra, Seaborg: radioactivity, Lavoisier: experimentation
Engineering: sorting and arranging. de Chancourtois: geology charting tool familiarity led to cylindrical/helical portrayal of element arrangement. Seaborg: Actinides moved outside the main table to join the Lanthanides. Alexander: removing gaps in atomic numbers integrated the d- and f-blocks with the main group
Math: determination of percentages and other measurements, numeracy in general
History: From Ancient Greeks through the European Middle Ages up to the present
The contents of each of the three PowerPoints are below.
#1 Ancient History through Alchemy to Experimentation:
Democritus, Leucippus, Anaxagoris, got western countries started, then Aristotle misdirected them. Denis Diderot, Lavoisier, and Dalton brought more science to the effort with experimentation. Avogadro's work was the foundation for Cannizzarro to provide critical data for real periodic tables.
#2 Modern Methods Produced Useful Element Arrangements
Periodicity was now recognized, in de Chancourtois 3D helical element arrangement, then Meyer's and Mendelev's flat versions. Moseley provided scientific reality to the numbers, and correct locations for the elements af the table.
#3 Real changes from the mid-1900s to the early 2000s
War driven atomic bomb research had Seaborg and the Manhattan Project crew developing many post uranium elements, some of which he put in an addendum called the f-block. He OK'd replacing it into the main table on Alexander's patented arrangement, which was similar to Courtine's, Gamow's, and the first periodic periodic table, de Chancourtois' Vis Tellurique.
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last update 3/17/16