Answer: Elements.
Explanation: A chemical element is a type of matter made up of atoms of the same class. Some elements have been found in nature and others obtained artificially, forming part of simple substances or chemical compounds. Others have been created artificially in particle accelerators or atomic reactors. The last ones are usually unstable and only exist for thousands of a second. Throughout the history of the universe, the variety of chemical elements have been generated from nucleosynthesis in several processes, mainly due to stars.
