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Dimitri Mendeleev noted that there was something regular in the list of chemical elements, with some groups of elements sharing similar characteristics. When he finally discovered the underlying pattern, he was able to correctly predict the existence, and even some properties, of so far unknown elements. Once your students solved this puzzle, they will see the periodic table with other eyes – and will have gained a far deeper understanding: https://www.sciensation.org/hands-on_experiments/e5103c_PeriodicTablePuzzle.html
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