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# Percent Empty Space of Calcium Metal

CHEM-BH3WJN

Calcium (MM=$40.078 \ g/mol$) metal crystallizes in a face-centered cubic unit cell. The radius of a calcium atom is $197 \ pm$.

What percentage of the cell is empty space?

A

$26\%$

B

$74\%$

C

$82\%$

D

There is no empty space in a solid