`AB` crystallizes in a body centred cubic lattice with edge length `a` equal to `387p m` .The distance between two oppositely charged ions in the lattice is :

Options

A. 300 pm
B. 335 pm
C. 250 pm
D. 300.5 pm

Answer

B

Explanation

For bcc ` r^(+)+ r^(-) = (sqrt3 a)/(2)`
` therefore r^(+) + r^(-) = (sqrt( 3xx 387))/(2) ` pm = 335.14 pm = 335 pm