Who published the first widely recognized periodic table in 1869?

Dmitri Mendeleev published the first widely recognized periodic table in 1869.

Mendeleev, a Russian chemist, arranged the known elements mainly by increasing atomic weight while grouping elements with similar chemical properties. His table included gaps for elements that had not yet been discovered. He also predicted several of their properties, giving the table unusual predictive power.

Later discoveries, including gallium, scandium, and germanium, matched important parts of his predictions. This success helped establish the periodic table as a powerful organizing framework rather than merely a list of known substances.

The modern table is arranged by atomic number, not atomic weight. Henry Moseley’s early twentieth-century work showed that atomic number provides the fundamental ordering principle. Mendeleev therefore created the crucial foundation, even though the table has since been refined.