Question

Iron has body-centered cubic lattice structure. The edge length of the unit cell is found to be $287$ pm. What is the radius (in pm) of an iron atom?

• A. $124.27$
• B. $150$
• C. $197.27$
• D. None of the above

Answer 1

The correct option is A $124.27$

For body centred structures $\sqrt{3}a=4r$
$⟹\sqrt{3}\times 287=4r$
$⟹r=124.27$ pm