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    Lead has an atomic radius of 175 pm and crystalizes in a face centered cubic structure. Find the mass of the unit cell in grams, the volume of the unit cell in cubic centimeters, and the density of the lead in g/cubic centimeters?

    I submitted this problem last night and I do not understand how you are getting the measurement of one side of the unit cell = 2 2r= 2 2 x 1.75 x 10^ -8 = 4.95 x 10 ^ -8cm???

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