4. A solid contains elements A and B.
Atoms A are arranged in ccp way,
atoms B occupy all the octahedral
voids and half of the tetrahedral
voids. What is the formula of the
solid? Ans. AB2
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THIS IS DONE BY THE FORMULA
= AB2
Hey!
ccp and fcc are same in 1 unit cell a total of 4 atoms of Q will be present as-
(0.5*6 faces) +(0.125*8 corners) =4
Now, as we know that there are 8 tetrahedral voids in fcc structure so 1 unite cell has 8 P atoms. Which gives us the formula of the compound as-P8Q4 which may also be written as P2Q.
Hope this helps !
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