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Unformatted text preview: CELL BIOLOGY MOLECULES AND BONDING 1. You have discovered a new element and named it after John Enwright (Je). You have discovered two uncharged stable isotopes of the element. The first isotope contains 120 neutrons and has a mass number of 240 and the second isotope has a mass number of 242. a. What is the number of protons, neutrons, and electrons in each isotope? b. How is a radioactive isotope different than a stable isotope? 2. Chlorine forms a covalent bond with hydrogen but an ionic bond with lithium. a. Draw the electron shell diagram for HCl. Is this a polar or nonpolar covalent bond? b. Use electron shell diagrams to show how the bond between Li and Cl is different than that between H and Cl. c. Explain why Cl bonds differently with H and Li. 3. O 2 and NH 3 are both small covalent molecules found in cells. NH 3 is extremely soluble in the aqueous environment of the cell, while O 2 is relatively insoluble. What is the basis for this difference in solubility between the two molecules? In reaching your answer, draw the structures of the molecules as valence shell between the two molecules?...
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This note was uploaded on 04/14/2008 for the course BIOL 116 taught by Professor Meyer during the Spring '08 term at Austin College.

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