`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 :

AB crystallizes in a body centred cubic lattice with edge length a equal to 365p m .The distance between two oppositely charged ions in the lattice is :

AB crystallizes in a body centred cubic lattice with edge length a equal to 365p m .The distance between two oppositely charged ions in the lattice is :

AB crystallizes in a body centred cubic lattice with edge length 'a' eqal to 387 pm. The distance between two oppositely charged ions in the lattice is :

AB crystallizes in a body - centred cubic lattice with edge length 'a' equal to 387 pm. The distance between two oppositely charged ions in the lattice is ______.