`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

Distance between two oppositely charged ions
`=(r^(+)+r^(-))`
`2(r^(+)+r^(-))=sqrt(3)a`
`(r^(+)+r^(-))=(sqrt(3)a)/2=(sqrt(3)xx387 "pm")/2=335"pm"`