Name: HW 3 of ETM 307 60 points in total, due on February 5, 2017 Monday What ar

Question

Name: HW 3 of ETM 307 60 points in total, due on February 5, 2017 Monday What are the atomic binding force and energy? How do they relate to materials strength and thermal stability? (10 points) 1. 2. What is the metallic bond? How is it formed? What are its characteristics? (10 points) 3. What is Van der Waals bond? How is it formed? What are its characteristics? (10 points) 4. What is the sp hybridization? What is the p-sp hybridization? (10 points) Diamond and graphite are both made of carbon. Diamond is an electrical insulator, is the hardest material in the word and is often used as a cutting tool. In drastic contrast, graphite is an excellent electrical conductor, is easy to be cut and is often used as a lubricant at high-temperature mechanical environments. You have leant the covalent bond, the van der Waals bond and the hexagonal carbon ring. Please explain why the properties of diamond and graphite are so different? (20 points) 5.

Explanation / Answer

Atomic binding force is the force which is required to deassemble the atom which means to make the electron deassemble from atom. The energy consumed to deassemble is called as BINDING energy. It has direct relationship with material stability.

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