Uploaded March 2026 | Updated September 2026, 2 weeks ago

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Mendeleev's original, 1869 version of the Periodic Table featured 63 elements. Now, there are 118. But as scientists worked to extend the Table (and fill in a bunch of holes), not every discovery turned out to be real.

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Sources: docs.google.com/document/d/e/2PACX-1vRQbGGN_8GjMwZSEatW7r-UAxU9XeCEkOU29eB6iUT7Vx__WisuZbibzsQ7XFPTQ3dt2cyOLkM7uyS_/pub