The density of $KBr$ is $2.75 \, g \, cm^{-3}$ and the unit cell edge length is $654 \, pm$. Given the atomic masses $K = 39$ and $Br = 80$, what is the crystal structure of $KBr$?
- AFace-Centered Cubic $(FCC)$
- BSimple Cubic $(SC)$
- CBody-Centered Cubic $(BCC)$
- DNone of these
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