Question

A compound is formed by two elements A and B.Atoms of the element B (as anion) make hcp and those of the element A (as cation) occupy half of all the octahedral voids.what is the formula of the compound?​

Answer 1

Answer:

Atom 'A' at FCC lattice points means number of atom A in unit cell is:

8

1

×8+

2

1

×6=4.

If in a close-packed structure (ccp or fcc) there are 'n' atoms or ions then the number of tetrahedral voids will be 2n. Thus the number of atom B is =2×4=8

Thus the compound is A

4

B

8

or AB

2

Answer 2

Answer:

Formula of the compound is AB2

Explanation;

HCP is similar to FCC.

TV=2x

OV=x

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