A solid has a structure in which, atoms of W. O and Na are located respectively at the corners, centre of edge and at the centre of the cubic lattice. The compound is NaWOx the value of x is:

The number of W atoms present at each corner =8×18=1Number of O atoms present at the centre of edges =12×14=3Number of Na atom present at the centre of cube = 1∴ Formula of the unit cell = WO3Na or NaWO3