Structure of materials

Elements

pure substance that cannot be broken down into any simpler substance

made up of only one kind of atom.

Can be found in the periodic table

Compounds

pure substance that is made up of two or more elements chemically combined together in a fixed ratio.

combined in a fixed ratio by mass.

Cannot be found on periodic table

Mixtures

made up of two or more substances that are not chemically combined together.

mixture can be mixed in any proportion.

can consist of a mixture of elements, a mixture of compounds or a mixture of both.

Cannot be found on periodic table

can be formed by combining the following through a chemical reaction:

elements with elements

elements with compounds

compounds with compounds

No chemical reaction takes place when a mixture is formed.

not chemically combined with each other.

Alloys are mixtures