Answer:
Elements and compounds
Step-by-step explanation:
Substances are purely classified as pure and impure substances.
Pure substances are those with a definite composition which are simply elements and compounds.
Impure substances are those with an indefinite composition which are mixtures.
- Elements are pure substances that are made up of only one kind of atom. About 117 known elements occur naturally.
- Compounds are distinct substances made up of two or more kinds of atoms/elements joined together in a definite grouping.
How are their properties different;
- Elements are made up of just a single type of atom where as compounds are made up of different atoms.
- Elements have a limited number whereas compounds are highly varied in nature.
- The properties of an element is a function of the type of atom that makes it up but the properties of a compound is distinct from those of the individual elements.
- Symbols are used to represent elements whereas chemical formulas are used to denote compounds.