* Elements are pure substances made up of only one type of atom (like oxygen, gold, or carbon).

* Compounds are formed when two or more different elements combine chemically in a fixed ratio.

Calcium hydroxide (Ca(OH)₂) is made up of three different elements:

* Calcium (Ca)

* Oxygen (O)

* Hydrogen (H)

These elements are chemically bonded together, forming a distinct new substance with properties different from the individual elements.