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# Calculate a Radius of an Atom in a Unit Cell

CHEM-JB1AFN

Iridium crystallizes in an FCC structure.

Calculate the radius of an iridium atom in $pm$, given that it has a density of $22.4 \ g/cm^{3}$ and an atomic weight of $192.2 \ g/mol$.

A

$136 \ pm$

B

$272 \ pm$

C

$108 \ pm$

D

None of the above