When was the periodic table first published in a form recognizable today?

Dmitri Mendeleev presented his periodic table in 1869, and it quickly became the foundation of modern chemistry. He arranged the known elements by atomic weight while leaving gaps for elements that had not yet been discovered. Mendeleev also predicted the properties of several missing elements, including gallium, scandium, and germanium, which were later found to match his forecasts closely. His table was not the final modern version, but it was the first widely successful periodic classification system.