Question

A compound XY crystallizes in bcc lattice with unit cell edge- length of 480 pm, if the radius of Y- is 225 pm, then the radius of X+ is

• A. 190.70 pm
• B. 22.5 pm
• C.
  127. 7 pm
• D. None

Answer 1

Answer: (A)

190.70 pm

Answer 2

For bcc structure.

$2(r_{+} + r_{-}) = \sqrt{3}a$

or $r_{+} + 225 = \frac{\sqrt{3}}{2} \times 480\therefore r_{+} = 190.7pm$