A hypothetical metal has a tetragonal unit cell for which the lattice parameters (in nm) are a=b=0.550, c=0.673 and all angles are 90 degrees. If there are 5 atoms per unit cell and the atomic packing factor is 0.63, determine the atomic radius in nm. Use 3.14 for pi. Give your answer to 3 decimal places. I got 0.197 the first time and it was incorrect.

Chemistry: Principles and Practice
3rd Edition
ISBN:9780534420123
Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Chapter11: Liquids And Solids
Section: Chapter Questions
Problem 11.72QE
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A hypothetical metal has a tetragonal unit cell for which the lattice parameters (in nm) are a=b=0.550, c=0.673 and all angles are 90 degrees. If there are 5 atoms per unit cell and the atomic packing factor is 0.63, determine the atomic radius in nm. Use 3.14 for pi. Give your answer to 3 decimal places.

I got 0.197 the first time and it was incorrect.

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