Anything that takes up space and has mass, matter is made up of atoms.

The smallest unit of a chemical element. Each atom consists of a nucleus, which has a positive charge, and a set of electrons that move around the nucleus.

Each element is made of one kind of atom. There are about 120 elements.

The periodic table is a list of all the chemical elements that exist in the universe that have been discovered by humans so far.
The periodic table categorizes and organizes elements according to the properties of their atoms.

A molecule is formed when two or more atoms join together. These may be two of the same atom or two different atoms.

A compound is formed when two or more DIFFERENT atoms join together. All compounds are molecules, but not all molecules are compounds.

The number to the far right of a molecule that tells how many molecules there are.

The small number on the bottom right of an atom that tell how many atoms are in the molecule(s)

When plants make their own food from the environment around them

When all living things break down glucose (sugar) to release energy.