Most matter can be broken down by reactions into basic units called elements.?

Most matter can indeed be broken down into basic units known as elements, which are pure substances that cannot be chemically simplified further. Elements are defined by the number of protons in their atomic nuclei and are organized in the Periodic Table. Through various chemical reactions, elements can combine to form compounds, but they retain their unique properties as individual entities. Understanding elements is fundamental to studying chemistry and the composition of matter in the universe.