Posted by Raynold on Thursday, November 8, 2012 at 12:56pm.
You must first determine the atomic mass of the element.
Convert 288 pm to cm then
volume = (?cm)^3 = volume unit cell
mass unit cell is volume x density = ?
Substitute for mass unit cell = [(#atoms/unit cell) x atomic mass/6.02E23] and solve for atomic mass of element.
Then moles element = 208/atomic mass.
mols x 6.02E23 = # atoms.
Post your work if you get stuck.
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