1.

Atoms C and Dformfcc crystalline structure. Atom C ispresent at thecorners of thecube and D is at theface centres of thecube. What is theformula of thecompound ?

Answer»


SOLUTION :Given : Crystal has fcc structure .
AtomsC areat 8cornerswhileatoms D are at 6 FACECENTRES of thecubicunitcell.
At thecorner .`(1)/(8)` th ofeach Catomis presentwhile ateachfacecentrehalfof each D ATOMIS present .
NUMBER of THEC atoms `= (1)/(8) xx 8=1 `
Number of Datoms `= (1)/(2)xx 6 = 3`
Thusunitcellcontainsone C atomand three D atoms
Hencetheformula of thecompoundis CD


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