Two or more different elements chemically combine to form compounds.

Every compound has a chemical formula.

Carbon, Ar, and Ne are examples of elements.

NaCl is an example of a compound that contains helium and oxygen atoms.

Compounds have properties different from the elements that make it up.

Essential for life

Can be broken down into a simpler substance

Located on the Periodic Table

Found on Earth

Cannot be broken down into a simpler substance

Examples of Matter

A section of the Periodic Table is shown. What is the Chemical Symbol for Magnesium?

The smallest particle of any particular type of matter is known by which of the following terms?

How many elements are in this compound?