Ch 3 Atoms and Electrons

Ch 3 Atoms and Electrons - Chapter 3 Problems Chemistry 101...

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Chapter 3 Problems Chemistry 101 Dr. Nielson 1. Which of John Dalton’s ideas is/are not exactly true? 2. Consider J.J. Thomson’s experiment with cathode rays. a. What did Thomson deduce from the fact that the “rays” where deflected by electric and magnetic fields? b. How did Thomson know the particles were negatively charged? 3. How many protons does tungsten have? What is the atomic number of tungsten? 4. How many electrons does a sulfur atom have? 5. How many neutrons does a Cl-37 atom have? 6. Lithium has two stable isotopes, Li-6 and Li-7. One of them has an abundance of 92.5% and one only 7.5%. Which is the more abundant isotope? 7. Mg-24 has mass = 23.985042 and 78.99% Mg-25 has mass = 24.985837 and 10.00% What is mass of Mg-26 isotope?
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Key Chapter 3 Problems 1. One of Dalton’s postulates is that all atoms of a given element are identical to one another in mass and other properties. However since an element can have several isotopes, then one atom of an element can differ slightly in mass and in other properties. So for example Carbon-14 has an approximate mass of 14 amu and is radioactive.
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This note was uploaded on 03/08/2012 for the course CHEM 101 taught by Professor Anderson,w during the Fall '08 term at BYU.

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Ch 3 Atoms and Electrons - Chapter 3 Problems Chemistry 101...

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