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Thallium chloride TlCl crystallises in e...

Thallium chloride TlCl crystallises in either a simple cubic lattice or fcc lattice of `Cl^-`ions with `Tl^+` ions in voids. If the density of solid is `7 "g/cm"^3` and edge length of unit cell is `3.85xx10^(-8)` cm. What is the geometry of unit cell ? (At. number of Tl=204.37 & Cl=35.5)

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`Z=(rho xx N_(0)xx a^(3))/(M)`
`Z=(7xx6.02xx10^(23)xx(3.85xx10^(-8))^(3))/(239.87)=1`
It means, it is a simple cubic lattice.
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