Each element is made of only one kind of atom




Water is made of one atom

Formed when to or more different atoms are joined together.




It has two different atoms.

The smallest unit of a chemical element.




It’s a unit of chemical element.

Formed when 2 or more atoms join together.


It has more than 2 atoms.

A list of all of the chemical elements that exist in the universe.


They exist in the universe.