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The total number of atoms in one unit cell of primitive unit cubic cell is ______ atom(s).(a) 1(b) 8(c) 4(d) 2I had been asked this question by my college professor while I was bunking the class.My question is taken from Solid State topic in portion Solid State of Chemistry – Class 12

Answer»

Right CHOICE is (a) 1

Best EXPLANATION: In primitive CUBIC unit cell, atoms are PRESENT only at the corner of the cell. Thus, in actual, only \(\frac{1}{8}\)th of an atom (or ion or MOLECULE) belongs to a particular unit cell. Hence, the total number of atoms in primitive cubic unit cell = 8 × \(\frac{1}{8}\) = 1 atom.



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