Mendeleev's predictions

Dmitri Mendeleev predicted the existence and properties of elements not yet discovered by organizing the periodic table based on patterns in known elements' properties. He noticed trends in atomic weights, colors, and reactivity, and left gaps for missing elements. By estimating their possible properties, he accurately forecasted elements like gallium, scandium, and germanium, which were later discovered. Mendeleev's predictions demonstrated the periodic table’s power to reveal relationships among elements and helped scientists understand the periodic law, ultimately shaping modern chemistry.