Question

Rubidium metal, Rb, crystallizes in a body-centered cubic arrangement. What is the radius of one atom of Rb, if its density is 1.5320 g/cm3?
2 atoms/unit cell
mass unit cell = 85.47*2/6.022e23 =?
volume = mass/density = ?
a^3 = volume
Solve fora.
Then 4r = a(3)^1/2
Solve for r.

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