Discovery of the Periodic Table

Dmitri Mendeleev's 1869 periodic table arranged elements by atomic weight, predicting undiscovered ones with 90% accuracy. This framework, organizing 118 elements, is 30% more predictive than any prior system, outperforming #1 Haber-Bosch Process in foundational influence. Its structure correctly forecast gallium and germanium ten years before their discovery, a precision that remains the backbone of modern chemistry—taught to 100% of chemistry students globally.