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PAGE1 - Fe2 Fe3 Cu Ba2 Br and S2[Problem 2.7 in text-~ 3...

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10 Louisiana State U niversity Mechanical Engineering Department ~ Professor Meletis Spring 2004 ME 2733 Materials of Engineering Homework Assignment #1 (due: in class Thursday, 02/05/04) The potential energy (V) between two adjacent ions in a solid can be represented by the expressIOn: B A v=- + a aU where a is the interatomic distance and A and B are constants. Calculate the bonding energy V o in terms of the parameters A and B using the following steps: (a) Differentiate V with respect to a, and then set the resulting expression equal to zero. Note that V versus a is minimum at V 0. (b) Solve the previous expression for a in terms of A and B. This yields ao, the equilibrium interatomic distance- ( c ) Obtain the expression for V 0 by inserting ao in the equation given above. 2 Give the electron configuration (shorthand electron notation) for the following ions
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Unformatted text preview: Fe2+, Fe3+, Cu+, Ba2+, Br-, and S2-. [Problem 2.7 in text] -~ 3 Sodium chloride (NaCl) exhibits predominantly ionic bonding. The Na + and CJ have electron structures that are identical to which two inert gases? [Problem 2.8] Ions 4. Detennine whether each of the electron configurations given below is an inert gas, a halogen, an alkali metal, an alkaline earth metal, or a transition metal. Justify your answers. (a) ls22s22p63s23p63d74s2; (b) ls22s22p63s23p6; (c) ls22s22p5; (d) ls22s22p63s2; (e) ls22s22p63s23p63d24s2; (f) ls22s22p63s23p64sl [Problem 2.10] 5 Use a computer software to make a plot of bonding energy versus melting temperature for the metals listed in Table 2.3. using this plot, approximate the bonding energy of copper, which has a melting temperature of 1084°C. [Problem 2.20] ~...
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