The Periodic Table (Dmitri Mendeleev)

The Periodic Table, created by Dmitri Mendeleev in 1869, is a systematic arrangement of chemical elements based on their atomic number and properties. Mendeleev organized the elements in rows and columns, noting that properties repeat at regular intervals, which led to the concept of periodicity. This structure allows scientists to understand relationships between elements, predict properties of unknown elements, and study chemical behavior. Mendeleev's table was revolutionary because it not only organized known elements but also left spaces for undiscovered ones, anticipating future discoveries in chemistry. Today, the Periodic Table remains a fundamental tool in science.