Knowledge of the type of packing and side length a of the unit cell will allow c

Question

Knowledge of the type of packing and side length a of the unit cell will allow calculation of the atomic radius, using one of the equations below. You may need to draw the unit cell to determine which formula to use to calculate the atomic radius.

Knowledge of the type of packing and side length a of the unit cell will allow calculation of the atomic radius, using one of the equations below. You may need to draw the unit cell to determine which formula to use to calculate the atomic radius. What is the atomic radius of sodium? too high A

Explanation / Answer

sodium is bcc

calculation will follow first example

for sodium a=4.2842 x 10-8 cm

hence, r= (sqrt3/4)*4.2842 x 10-8 cm= 1.855 x 10-8 cm= 185.5 pm.

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