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The fascinating backstory of the periodic table, which is about to turn 150 years old - Los Angeles Times

When Mendeleev started lining up elements with similar properties into columns, he noticed that, in some places, an element seemed to be in the wrong place and should be one column over. When he moved it over, everything worked out. But then there’s an empty gap. And he’s like, “OK, how do I explain what’s in the gap?”

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https://www.latimes.com/science/sciencenow/la-sci-sn-periodic-table-150-birthday-20190131-story.html

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