Everything in the world is made up of one or more elements. The Periodic Table of Elements charts all the different elements and their characteristics. It is organized by each element's mass.
Scientist Dimitri Ivanovich Mendeleev wrote the first Periodic Table in 1869. But this version was missing three elements—Scandium, Gallium, and Germanium—which were later discovered.
The Periodic Table is separated into nine groups: alkali-metals, alkali-earth metals, transition metals, rare Earths, radioactive rare Earths, poor metals, semimetals, non-metals, and noble gases. Each element classification contains four sub-components: the element’s mass number, its symbol, its atomic number, and its scientific name.
Studying the Periodic Table of Elements, scientists can tell if any element is a metal or non-metal. With this knowledge, they know if an element will conduct electricity, and they can also predict how certain elements will react with one another.
The Periodic Table has helped many scientists throughout the years. For example, Marie Curie discovered the element Radium, which doctors eventually used to treat cancer. The Periodic Table of Elements has overall changed the world's perspective on science.