Atoms of two or more elements chemically combined are called a compound.

Here's why:

* Elements are the simplest pure substances that cannot be broken down further by chemical means.

* Compounds are formed when two or more different elements chemically combine in a fixed ratio. This means the atoms of the elements are held together by chemical bonds.

For example, water (H₂O) is a compound made of hydrogen (H) and oxygen (O) atoms. The ratio of hydrogen to oxygen atoms in water is always 2:1.