Compound vs Element:

Definition:
- Compound: A compound is a substance formed by the chemical combination of two or more elements in definite proportions.
- Element: An element is a pure substance composed of only one type of atom.

Composition:
- Compound: Compounds are composed of two or more elements chemically bonded together. They can be broken down into simpler substances through chemical reactions.
- Element: Elements are made up of only one type of atom and cannot be broken down into simpler substances by chemical means.

Examples:
- Compound: Examples of compounds include water (H2O), sodium chloride (NaCl), and carbon dioxide (CO2).
- Element: Examples of elements include oxygen (O), gold (Au), and hydrogen (H).

Physical Properties:
- Compound: Compounds have unique physical and chemical properties that differ from the elements they are composed of.
- Element: Elements have distinct physical properties such as color, density, and melting point.

Chemical Properties:
- Compound: Compounds exhibit chemical properties that are different from the elements they are made of. They can form new substances through chemical reactions.
- Element: Elements have characteristic chemical properties that determine how they react with other substances.

Representation:
- Compound: Compounds are represented by chemical formulas that show the types and ratios of elements present in the compound.
- Element: Elements are represented by symbols from the periodic table that indicate the type of atom present.
In conclusion, compounds are composed of two or more elements chemically bonded together, while elements are pure substances made up of only one type of atom. Their composition, properties, and representation distinguish compounds from elements in the realm of chemistry.