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Randomized to Organized lesson
The key devices are: a 3D Forever Periodic Table Model of the Alexander Arrangement of Elements, introduced at the end of the lesson; a 3 part PowerPoint called PAST AND PRESENT ARRANGERS OF CHEMICAL ELEMENT SYSTEMS used throughout, in 3 segments, and the TrendsTube® 3D element property reference device.
Students will engage in first hand experience of how the periodic table was originally mapped accompanied by an introductory PowerPoint of pre-periodic table history.
Given a sheet of group 1a and 2A element jumbled property data boxes students will sort them into categories and position them based only on the data they bear using simple logic with numbers.
Students will explore and discover property relationships, organize according to one, then another without altering the first, which they will discover requires a three-dimensional solution.
At appropriate points during the lesson, students will view another segments of the periodic table history slides and hold related discussions related to the technology advances that contributed to each improvement in understanding the organization of the elements. The TrendsTube® will be used when describing the valence concept, followed by revealing the 3D Forever when appropriate in the PowerPoint.
Despain & Alexander 2014


Trends lesson segment
The key device is a downloadable (free) printed chart consisting of the Main Group Elements from the 2nd to the 6th row, the TrendsTube®. Groups are titled with the old and new IUPAC designations. Element box data is symbol, atomic number, mass, and element name.
Intended for use prior to introduction of the periodic table - flat or AAE - this can be the whole or part of an element property trends lesson. When all students have a TrendsTube®, teaching proceeds about properties and trends as usual.
When discussing valence and ionization energy, the students will trim and tape their page into a tube.
The rows of element boxes slant a full box height down from the left, and when wrapped and joined during the lesson, this allows the Noble Gases to be adjacent to both elements that 'want' to be like them - one with an electron more and one with one less - in atomic number sequence.
This is similar to the Main Groups column on the 3D Forever AAE, and so is highly recommended to be used when the Forever is to be the core of the introduction to the periodic table to follow, although the TrendsTube® is an improvement over the usual flat charts, so can be used even if the PT Intro Lesson is to be with them.

Alexander 2015
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