Question

A compound formed by two elements a and b crystallises in cubic arrangement in which a atoms are present at corners of cube and b atoms are at fcc what is the formula of a compound

Answer 1

Hey here is ur answer....

Since element A is present at corners,
So as we have 8 corners and each atom at the corner contributes 1/8 part of it into the lattice...

So toatal A atoms =8x1/8
. = 1

And B element is at face centres.
As we have 6 faces and each atom at face centre contributes 1/2 part of it into the lattice ....

So total B atoms = 6x1/2
. = 3

Now ...
A:B = 1:3

So the formula becomes .,
AB3


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