HW1 - the two expressions above. a) Superimpose on a single...

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ECE331 Homework #1 (Due Friday, April 04, 2008) 1. Relative to electrons and electron states, what does each of the four quantum numbers specify? 2. Sodium Chloride (NaCl) exhibits predominantly ionic bonding. The Na + and Cl - ions have electron structures that are identical to which two inert gases? 3. For a Na + - Cl - ion pair, attractive and repulsive energies E A and E R , respectively, depend on the distance between the ions ‘r’, according to E A = E R = For these expressions, energies are expressed in electron volts per Na + - Cl - pair, and r is the distance in nanometers. The net energy E N is just the sum of
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Unformatted text preview: the two expressions above. a) Superimpose on a single plot E N , E R and E A versus r up to 1.0 nm. b) On the basis of this plot, determine (i) the equilibrium spacing r between the Na + and Cl-ions, and (ii) the magnitude of the bonding energy E 0 between the two ions. 4. Using Table 2.2, determine the number of covalent bonds that are possible for atoms of the following elements: silicon, bromine, nitrogen and sulfur. 5. Show that the atomic packing factor for BCC is 0.68 6. Show that the atomic packing factor for HCP is 0.74 7. Show that the APF for diamond cubic is 0.34...
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This note was uploaded on 05/05/2010 for the course ECE 331 taught by Professor Rajan during the Spring '09 term at Ohio State.

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