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Na and Mg crystallise in b.c.c and f.c.c type crystals respectively , then the number of atoms of Na and Mg present in the unit cell of their respectively crystal is

$(a)\;4\;and\;2\qquad(b)\;9\;and\;14\qquad(c)\;14\;and\;9\qquad(d)\;2\;and\;4$

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No of unit cell in b.c.c is 2
No of unit cell in f.c.c is 4
Hence answer is (d)
answered Feb 17, 2014 by sharmaaparna1
 

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