Friday, November 17, 2006

 

Auctioneer Friday

Another abbreviated class period today...get ready for yet another one on Tuesday...

AP: we finished the electronegativity trend emphasizing Zeff and the PEL of the shared electrons as the determining factors while considering electron-electron repulsion to be an insignificant factor for this property.
Then, we covered "electron affinity" and noted several anomalies (always draw the orbital diagram and the anomalies will be explicable). Remember, for ANY anomaly on ANY AP exam, the data WILL be given because anomalies are NOT predictable BUT they can be explained in terms of Zeff, OPELS, shielding, and electron-electron repulsion.

Regents: we finished our Periodic Table trends and explanations thereof in terms of Zeff and OPEL's. We will wrap up the unit by talking more about individual groups of elements and some other facts about elements on the Periodic Table. Do the Orange Review Book homework and the LAB writeup this weekend.

Honors: we talked about Mr. Moseley and his deduction of the nuclear charge of each element. He used x-ray emission data from each element and related the x-ray frequencies to what must be the positive nuclear charge. He and Rutherford then related the nuclear charge to the number of protons in the nucleus of an atom. The Periodic Table was then changed to an arrangement in order of increasing ATOMIC NUMBER. Thus, the Te/I anomaly went away and the elements displayed a more orderly periodic change across each period and the elements were chemically similar in each group. We began to discuss the three main types of elements on the Periodic Table: the metals, the semi-metals/metalloids, and the nonmetals. Do the text hw and the lab writeup over the weekend.
Thanks.



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