 "Mendeleev’s Periodic Table")
In March 1869, Dmitri Ivanovich Mendeleev presented a chart to the Russian Chemical Society. This is generally considered to be the first Periodic Table. It was a spreadsheet listing all the known elements in groups. The Table remains a basic tool of chemistry. The latest new entries were added in the 21st century, almost 150 years after the first table was prepared.
It was an incredible achievement. Little was then known about molecules, or atoms, and the existence of fundamental particles had not even been suspected. Despite that, Mendeleev had discovered what are called the Periodic Laws: He found that elements
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