`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. 335 pm
B. 250 pm
C. 200 pm
D. 300 pm

Answer

A

Explanation

For BCC
`r^(+)+r^(-)=(sqrt(3)a)/(2)`
`therefore r^(+)+r^(-)=(sqrt(3)xx387)/(2)pm`
`=335.4pm ~~ 335pm`