Question: 1. Briefly cite the main differences between ionic, covalent, and metallic bonding. 2. What is the difference between an allotrope and a polymorph? 3. What

1. Briefly cite the main differences between ionic, covalent, and metallic

1. Briefly cite the main differences between ionic, covalent, and metallic bonding. 2. What is the difference between an allotrope and a polymorph? 3. What is the difference between atomic structure and crystal structure? 4. Bromium has two naturally occurring isotopes: 79Br, with an atomic weight of 78.918 amu, and 81Br, with an atomic weight of 80.916 amu. If the average atomic weight for Br is 79.903 amu, calculate the fraction-of-occurrences of these two isotopes. 5. What is the electronegativity of C considering SiC is 11% ionic and Xsi = 1.8? 6. A hypothetical metal has the BCC crystal structure, a density of 7.24 g/cm', and an atomic weight of 48.9 g/mol. Calculate the atomic radius of this metal. 7. Zirconium has an HCP crystal structure and a density of 6.51 g/cm3. (a) What is the volume of its unit cell in cubic meters? (b) If the c/a ratio is 1.593, compute the values of c and a. Consider the unit cell volume, Vc = 6R2cv3

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