1.

Na and Mg crystallize in bee and fcc type crystals respectively, then the nwnber of atoms ofNa and Mg present in the unit cell of their respective crystal is

Answer»

4 and 2
9 and 14
14 and 9
2 and 4

Solution :In BCC- POINTS are at corners and one in the centre of the unit cell.
Number of atoms per unit cell`=8xx(1)/(8)+1=2`. ,brgt In fcc-points are at the corners and ALSO centre of the six faces of each cell.
Number of atoms per unit cell`=8xx(1)/(8)+6xx(1)/(2)=4`.


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