The periodic table of chemical elements, often called the periodic table, organizes all discovered chemical elements in rows (called periods) and columns (called groups) according to increasing atomic ...

The blue commemorative plaque placed at Newlands’ birthplace, declaring him the “discoverer of the Periodic Law for the chemical ... Initially, the table had similar elements in horizontal rows, but ...

This year marks the 150th anniversary of the publication of Mendeleev’s Periodic Table of Chemical Elements in 1869. In celebration, the United Nations Educational, Scientific, and Cultural ...