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The most important step taken by Mendeleev in developing the Periodic Table of elements was the realization that chemical properties come in a repeating pattern, as elements get heavier. They go from metals to nonmetals to noble gases, and then back to metals.

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Q: What was the most important step in the development of the periodic table?
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Are only the most important elements included in the periodic table?

no. all elements discovered (and proposed) are included in the periodic table


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