Here's a breakdown:
* Compound: A substance formed when two or more different elements are chemically bonded together in a fixed ratio.
* Element: A pure substance consisting of only one type of atom.
Examples:
* Water (H₂O): The constituent elements are hydrogen (H) and oxygen (O). There are two hydrogen atoms and one oxygen atom in every molecule of water.
* Sodium chloride (NaCl): The constituent elements are sodium (Na) and chlorine (Cl). There is one sodium atom and one chlorine atom in every molecule of sodium chloride.
* Carbon dioxide (CO₂): The constituent elements are carbon (C) and oxygen (O). There is one carbon atom and two oxygen atoms in every molecule of carbon dioxide.
Key Points:
* Fixed Ratio: The elements in a compound are always present in a fixed ratio.
* Chemical Bonds: The atoms in a compound are held together by chemical bonds, which are strong forces of attraction.
* New Properties: Compounds have properties that are different from the elements they are made of.
Understanding the constituent elements of a compound helps us understand its chemical structure, its properties, and how it will react with other substances.
