Laying the groundwork Legend has it that Mendeleev conceived and created his table in a single day: February 17, 1869, on the Russian calendar (March 1 in most of the rest of the world). But that ...

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 periodic table, also called the periodic table of elements, is an organized arrangement of the 118 known chemical elements. The chemical elements are arranged from left to right and top to ...

The periodic table on the website of the International Union of Pure and Applied Chemistry avoids making a decision about whether La and Ac or Lu and Lr are group 3 elements.

The Periodic Table enables scientists to predict the appearance and properties of elements that were yet to be discovered. A few decades later, following the discovery of radioactive elements, Marie ...

The classic Periodic Table organizes the chemical elements according to the number of protons that each has in its atomic nucleus. (Image credit: Karl Tate, Livescience.com contributor) ...