Key terms

• Element - A substance that is made of only type sort of atom
• atoms -
the smallest particle of a chemical element that can exist
• molecules
- a group of atoms bonded together
• mixture -
a physical combination of two or more substances that aren't chemically joined
• compound -
a substance made up of two or more different elements chemically bonded
• Atom / element

  
• Compound

  
• Molecule