THESE QUESTIONS CAN HAVE MULTIPLE ANSWERS: 1. As the temperature of a crystalline solid increases (but the temperature is still below the melting point), which of the following happens? A. self-diffusion decreases B. vacancy concentration increases C. vacancy concentration decreases D. resistivity decreases 2. Which of the following will both increase the yield strength and conductivity of a metal? A. Grain size reduction B. Adding impurities in solid solution C. Cold working D. None of the above

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Group 14 Elements

The following elements come under group 14 of the periodic table.