The substance made up of only one kind of atom is called an element. To determine this, one can consult the periodic table, which is a chart displaying all known elements. Each element is represented by a unique symbol, such as H for hydrogen, O for oxygen, or Na for sodium. Examples of elements include iron, carbon, gold, and helium. In contrast, a compound is composed of two or more different elements chemically bonded together, while a mixture is a combination of two or more substances that are not bonded together. Finally, a solution is a type of mixture in which one substance, called the solute, is dissolved in another substance, called the solvent.
An element is a substance made up of only one kind of atom.
