Dmitri Mendeleev · Science
How Mendeleev found that if you line up the chemical elements in order of weight, their properties do not change at random but repeat in a regular rhythm - that there is a hidden periodic law governing all of matter. It was the discovery that turned a jumble of sixty-odd substances into a single ordered system.
You learned that Mendeleev discovered the periodic law: that the properties of the elements repeat at regular intervals when the elements are arranged by atomic weight. In your own words, explain what ‘periodic’ means here, how families of similar elements emerge, and why this was a profound claim about th…
Leads to Antoine Lavoisier.
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