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bild1psanswers - Problem Set 1 BILD1 Spring 2009 1 Its a...

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Problem Set 1 BILD1 Spring 2009 1. It’s a relaxing Sunday morning. Since you are a scientist, you love to kick back and answer questions about atoms. Answer the following questions. a. For the below elements, complete the chart: Atomic # Mass # # of Protons # of Neutrons # of Electrons Cl 17 35 17 18 17 N 7 14 7 7 7 C 6 12 6 6 6 Mg 12 24 12 12 12 b. What is an isotope? If we were talking about the C 13 isotope for the carbon atom, how would the above chart differ? An isotope is a variant of an element which has a different number of neutrons. For carbon-13, the number of neutrons would be 7 instead of 6 and the mass number would increase to 13. c. For the same elements in the chart above, how many electron shells does each atom possess? How many valence electrons does each possess? Cl – 3 shells, 7 valence N – 2 shells, 5 valence C – 2 shells, 4 valence Mg – 3 shells, 2 valence 2. True or False? a. In a cell, all chemical reactions are not always reversible. T b.
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