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CBSE Class 12-science Answered

if in a fcc unit cell A atoms are at corners B  atoms are at face centres and one of A atoms are missing from each unit cell then what is the formulae of compound
Asked by Farooq Ahmad Shah | 01 Nov, 2015, 08:53: PM
answered-by-expert Expert Answer
Number space of space atoms space of space straight A space at space the space corners space equals space 7 space left parenthesis because space one space is space missing right parenthesis Hence comma space contribution space of space straight A space topwards space unit space cell space equals space 7 space cross times 1 over 8 space equals space 7 over 8 Number space of space atoms space straight B space at space the space face minus centres space equals space 6 Hence comma space contribution space of space atom space straight B space towards space unit space cell space equals space 6 cross times 1 half equals 3 Ratio space of space straight A colon straight B space equals space 7 over 8 colon 3 equals 7 colon 24 Thus comma space the space formula space of space FCC space is space straight A subscript 7 straight B subscript 24
Answered by Prachi Sawant | 02 Nov, 2015, 10:05: AM

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