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In this lesson we took a fairly detailed look at the structure of the atom. Of particular importance was the behavior of the electrons. This behavior is determined by the magnitude of the positive charge in the nucleus and by the arrangement of the electrons in the atom. The wave mechanical model of the atom - also called quantum mechanics - gives us the best and most accurate picture of electron behavior. In particular, it describes with reasonable accuracy what happens with the valence electrons, the outermost electrons in the atom, the electrons that are involved in chemical reactions. In the next lesson, we will use what we have learned about atomic structure to try to understand some of the chemical behavior of the elements. For example, what is the difference between a non-metal and a metal? How do they react, how do they react differently, and why? We will also see how the periodic table of the elements arises and learn some of the different kinds of things it can tell us about the elements. Be sure to complete and turn in the lab assignment and the problem set found in your workbook. The purpose of the lab experiment this week is to observe the flame spectra of some different known samples and to identify three unknown samples based on the knowns; don't forget to include the identities of your unknown samples in the Results section of your lab report! A second purpose was to observe the spectra of some gaseous elements in the discharge tubes; be sure to include those observations in your lab report as well. Try the self-quiz and check your answers before you come to the lab to take the quiz for this lesson. If you need help, you know whom to call.
E-mail instructor: Eden Francis Clackamas Community College
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