When Was the Periodic Table First Introduced?
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1869. Thanks, Mendeleev!
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1869 - it's older than your grandma's grandma!
Mendeleev introduced the periodic table in 1869, but he built on the work of many scientists before him. Team effort, folks!
The periodic table was first introduced in 1869 by Dmitri Mendeleev. It's been evolving ever since!
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