Both NaCl and KCl crystallize with the foc structure. However, the X-ray powder diffraction pattern of NaCl corresponds to the foc structure whereas, that of KCI corresponds to simple cubic structure. This is because

Options

A. `K^+` and `Cl^-` are isoelectric.
B. `Na^+` and `Cl^-` are isoelectric.
C. `K^+` and `Cl^-` are disordered in the crystal lattice.
D. KCl has anti-site defects.

Answer

A

Explanation

Since `K^+` and `Cl^-` are isoelectric , some of the peaks are missing entirely . The scattering intesities for X-rays are directly related to the number of electrons in the atom . Ligh atoms scatter X - rays weakly, while heavy atoms scatter X-rays more effectvely