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# Percent Occupancy of a Unit Cell of Iridium

CHEM-YSSYPS

Iridium crystallizes in an FCC unit cell.

Given that the radius of an iridium atom is $136 \ pm$, calculate the percentage of the unit cell occupied by its atoms.

A

$26 \%$

B

$74 \%$

C

$82 \%$

D

There is no empty space in a solid