Question

A solid has a structure in which W atoms are located at the corners of a cubic lattice, O atom at the centre of the egdes and Na atom at centre of the cube. The formula for the compound is:

• A. $NaW{O}_2$
• B. $NaW{O}_3$
• C. $N{a}_{2}W{O}_3$
• D. $NaW{O}_4$

Answer 1

Answer: (B)

$NaW{O}_3$

The number of atoms per unit cell are given below:

Number of Na atoms $=1\times 1=1$

Number of W atoms $=\frac{1}{8}\times 8=1$

Number of O atoms $=\frac{1}{4}\times 12=3$

Therefore, the compound is $NaW{O}_3$.