Who created the first widely recognised periodic table of the chemical elements?

Dmitri Mendeleev created the first widely recognised periodic table of the chemical elements.

The Russian chemist presented his periodic classification in 1869. He arranged known elements primarily by increasing atomic weight and placed elements with similar chemical properties in the same groups. Crucially, he left gaps where he believed undiscovered elements belonged.

Mendeleev used those gaps to predict the properties of several unknown elements. Later discoveries, including gallium in 1875 and germanium in 1886, closely matched his predictions. These successes persuaded many scientists that the periodic law captured a real pattern in chemical behaviour.

The modern table is ordered by atomic number rather than atomic weight, following work by Henry Moseley in the early twentieth century. Even so, Mendeleev’s insight remains the foundation of the familiar arrangement of periods and groups. He did not discover every element in the table, and earlier scientists had proposed partial classifications, but his system was the first to gain broad scientific acceptance.