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CPO Science Integrated Physics & Chemistry Chapter 18.2 Comparing Atoms 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? Tips Run The Experiment 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 electron neutron proton 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?