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Silicon used in computer chips must have an impurity, level below 10 -9
(that is, fewer than one impurity atom for every 10" atoms). Silicon has a diamond
crystal structure. Each cubic unit cell (edge length a-543 pm) contains eight Si atoms. If there are 5.8 x 10¹3 boron atoms per cubic centimeter in a sample of
B atoms
pure silicon, what is the ratio
Si atoms
B atoms
Si atoms
? Round your answer to 2 significant digits.

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