This document provides an overview of the periodic table of elements. It explains that in 1869, Dmitri Mendeleev arranged the 63 known elements according to their atomic mass, which demonstrated trends in their chemical properties. Mendeleev organized the elements into a table with periods and groups. The table is organized to make the elements easy to use and understand, with key terms like atomic number, symbol, and name. It provides examples of elements like vanadium, beryllium, and carbon, including their atomic information and common uses.