# Chemistry

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Copper has density of 8.94 and crystallizes with the face-centered cubic unit cell. Calculate the radius of a copper atom.

• Chemistry -

There are 4 atoms to the unit cell so the mass of a unit cell is
4*atomic mass Cu/6.02E23 = ?
density = mass/volume
Substitute mass and density and solve for volume = ?
V1/3 = edge length = a
4r = a*21/2
Solve for r. My periodic table says Cu is 1.28 angstroms.

• Chemistry -

127.3

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