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Crystal lattices and unit cells

Caesium atoms are the largest naturally occurring atoms. The radius of Cs atom is 2.6 Ao. The number of moles of Cs atoms to be laid side by side to give a row of Cs atoms 2.50 cm x × 10-17 . Find the value of x.


Diameter of Cs =2×2.6=5.2=5.2×108cm 

Number of atoms in 2.50 cm 2.50 row = 2.505.2×108

=0.48×108=4.8×107Cs atoms 

 Moles of Cs atoms =4.8×1076×1023=0.8×1016



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