Warm Up Question – Name the three subatomic particles. – List anything you think you might know about them. Matter & The Atom Matter Anything that has mass and takes up space (has volume) Made up of different kinds of atoms All matter is made of atoms Atomic Structure Atomic Structure Inside Nucleus Protons Neutrons Outside Nucleus-Electrons Atomic Structure Tiny Electrons Negative charge Move outside the nucleus Atomic Structure Big Protons Positive charge Inside the nucleus Atomic Structure Big Neutrons No charge: neutral Inside the nucleus Atomic Structure energy level protons + electrons + neutrons - nucleus Describing Atoms Atomic Number = # of protons the # of protons = the # of electrons Atomic Mass Number = protons + neutrons. Valence Electrons: Only the electrons in the outer shell of an atom 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.