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 ...

Alexandre Béguyer de Chancourtois was a geologist ... Newlands did not leave any gaps for undiscovered elements in his table, and sometimes had to cram two elements into one box in order to keep the ...

Can you name everything from Ac to Zr? Test your knowledge of the periodic table and see if you can top the leaderboard ...