Silver crystallizes in face-centred cubic unit cell. Each side of this unit cell has a length of 400 pm. Calculate the radius of the silver atom. (Assume the atoms touch each other on the diagonal across the face of the unit cell. That is each face atom is touching the four corner atoms).

Explanation

Here, a = 400 pm
Radius for face-centred cubic unit cell is
`r=a/(2sqrt2)=400/(2sqrt2)=400/(2xx1.41)=400/2.82=141.84`