Chapter 7 - Chemistry 113 Reading Assignment#7 Chapter 7#1...

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Chemistry 113 Reading Assignment #7 Chapter 7 #1 The Periodic Table – a closer look. A. Approximately how many elements had been ‘discovered’ (or, identified) by 1918 when the evidence of subatomic particles was confirmed? 86 B. What did the organization of the periodic table allow to 19 th century scientists who were speculating on elements that had not yet been identified? It allowed them to categorize the elements and their properties better. #2 Completed shells of electrons in an atom (recall principal quantum numbers) will form ‘layers’ much like in an onion. The outermost layer of electrons is attracted to the positive charge in the nucleus but will experience a blocking effect from the inner layers of electrons. With this is mind describe Effective Nuclear Charge . Effective nuclear charge is the estimation of the net attraction of each electron to the nucleus by considering how it interacts with the average environment created by the nucleus and the other electrons in the atom. This approach allows scientists to treat each
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Chapter 7 - Chemistry 113 Reading Assignment#7 Chapter 7#1...

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