Atoms of element B form hcp lattice and those of the element A occupy 2/3rd of tetrahedral voids. What is the formula of the compound formed by the elements A and B?

Explanation

Atoms Y adopt hep arrangement and there are two tetrahedral sites per atom of Y.Since 2/3rd tetrahedral sites are occupied by atoms of X. Then for each atom of Y, the number of
X atom will be `=2xx2/3=4/3` Formula of compound `X_(4//3)Y` or `X_4Y_3`