A closer look at “6 Times Scientists Were Wrong About the Periodic Table”, exactly as the source publishes it. Visit to get started learning STEM for free for a full 30 days and get 20% off their annual premium subscription. Mendeleev's original, 1869 version of the Periodic Table featured 63 elements.
But as scientists worked to extend the Table (and fill in a bunch of holes), not every discovery turned out to be real. Support us for $8/month on Patreon and keep SciShow going! The full version stays on the original page, which this listing opens directly.