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An element crystallises' into a, structa...

An element crystallises' into a, structare which may be described by a cubic type of unit celt having one atom on each C0rner of the cube and two atoms on one of its diagonals. If yolume of this unit cell is 24x`10^-(24)` `cm^3` and density of element is 7.2 g / `cm^-3`. calculate the number of atoms present in 200 g of the element .

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