Good question. In short, Dmitri Mendeleev noticed that certain properties of the elements repeated, i.e., were periodic. This allowed him to create an initial framework for the elements that had rather intriguing empty spaces. In this way, he predicted as yet undiscovered elements. A periodic table. Eventually these discoveries happened. A longer version of how … Continue reading How Did They Make The Periodic Table?
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source http://gregladen.com/blog/2018/01/30/make-periodic-table/
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