Teacher Resources  Chapter 18 Color Teaching Transparency —Ch 18.2a Ch 18.2bCh 18.2aCh 18.2b  Laboratory Black line Masters Laboratory Black line Masters  Electronic Book Electronic Book  Skill Sheets

Chapter 18.2 Comparing Atoms CPO Science Integrated Physics & Chemistry

Developing A Model  What subatomic particles are found in the nucleus? —Protons & Neutrons  Are there any other subatomic particles? —Electrons —Due electrons stay in one place?  What keeps the electrons from flying off the atom?

Developing A Model  What are the charges of the subatomic particles? —Protons = positive —Neutrons = neutral If this is true what is the charge of the nucleus? —Electrons = negative  What keeps the electrons from flying off the atom?  Electromagnetic force: opposites attract & likes repel  Then what holds the nucleus together?

Key Questions  How are atoms put together?  How are atoms identified?  What are isotopes & ions?  What is the connection between atomic structure & light?

Developing An Experiment  How would you use this model to build lithium – 6 —How many protons does this atom have? —How many neutrons? How do you know? —How many electrons? How do you know?  Now build your own lithium-6  How could you build lithium-7?  How can you create a charged lithium atom either positive or negative?

Run The Experiment  Tips  Read over section 1 & 2 very carefully before you get started  Follow the rules.  When you have played at least 2 games start section 3 in the investigation manual.

What did you learn?  Complete section 3 in the investigations manual

Developing An Experiment  What cause light?  Do you think different elements give off different colors of light? —Why?  What are some common lights? —What color of light do they produce?

Run The Experiment  Tips: —Read section 5 before you get started —Point the slit at the right of the spectrometer directly at the light source. —Record where the vertical line appears —You may have to estimate the value

What did you learn?  Can the spectral lines help you identify the element?  Do the the spectral lines explain the colors of the light?  Can you think of any ways to use this information?

Summary  How are atoms put together?  What are some ways to can identify an atom?  What is an ion & an isotope?  How is the atomic configuration connected to the light an element produces?