1. Warm Up Question • Name the three subatomic particles. • List anything you think you might know about them.

2. Matter &The Atom

3. Matter • Anything that has mass and takes up space (has volume) • Made up of different kinds of atoms

4. All matter is made of atoms

5. Atomic Structure Protons Atomic Structure Inside Nucleus Neutrons Outside Nucleus-Electrons

6. Atomic Structure Tiny Electrons Negative charge Move outside the nucleus

7. Atomic Structure Big Protons Positive charge Inside the nucleus

8. Atomic Structure Big Neutrons No charge: neutral Inside the nucleus

9. - + + - Atomic Structure energy level protons nucleus electrons neutrons

10. Describing Atoms • Atomic Number = # of protons • the # of protons = the # of electrons • Atomic Mass Number = protons + neutrons.

11. Valence Electrons: Only the electrons in the outer shell of an atom

12. Think About It… • Make a Brace Map of an Atom. Break it down into its three subatomic particles and list a few characteristics of each.