The Elements

Elements are pure substances made of only one type of atom, which is the smallest unit of matter that retains its properties. Each element is identified by a unique symbol and organized in the periodic table. They combine in various ways to form all the materials around us, from gases like oxygen to metals like iron and nonmetals like sulfur. Elements can exist naturally or be created in laboratories. Understanding elements helps explain the nature of matter, chemical reactions, and how substances interact in our universe.