Question

A compound is formed by two elements P and Q. Atoms of Q (as anions) make hcp lattice and those of the element P (as cations) occupy all the tetrahedral voids. What is the formula of the compound?

Answer 1

Since p occupy tetrahedral void,

P= 2N and Q = N

2N P: N Q ( N gets cancelled )

2P:Q

THUS THE EQUATION IS : P2Q1