Alexander Arrangement of Elements
Coronavirus Response:
Free Downloadable Support Material for the
Discovery of How Elements
Naturally Arrange Themselves
When Strictly Obeying the Periodic Law

Tiered Learning, as well as the general level of a class, will help you select the best jumbled element cards from the four versions imaged below, which you may tap for a page you can compose and email to students for printing and carrying out this PT building experiment, including suggested instructions.

The image at the right is the most complex, without Atomic Numbers to help, and enough elements so that the Ar/K reversal* occurs.
Tap a chart for its student email suggestion. Jumbled Data Boxes
Minimal property data in 20 boxes
for teachable reversal at Ar & K*.
Less difficult to solve than the above, as the properties of these 20 elements include their atomic numbers.
Jumbled Data Boxes
Property data including Atomic Numbers
for teachable reversal at Ar & K*.
Easy to solve by avoiding the Ar/K reversal* by leaving out Argon & Potassium, but excluding the atomic numbers.
Jumbled Data Boxes
No Atomic Numbers in 17 boxes slows
sorting, BUT avoids reversal at Ar & K*.
The image at the right is the easiest to solve, as it has both Atomic Numbers and not enough elements so that the Ar/K reversal* occurs.
Jumbled Data Boxes
Atomic Numbers in 17 boxes speeds
sorting AND avoids reversal at Ar & K.

*Ar/K reversal is the Argon/Potassium order switch in the periodic table, which is based on the number of protons in the nucleus, the Atomic Number, instead of mass or weight, which would reverse their order, as Ar is more massive.
A student using weight as a property would discover the anomaly.

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