Which of the following statements are false:

Options

A. The radius of a metal atom is taken as half the nearest metal-metal distance in a metallic crystal.
B. One tetrahedral void per atom is present in hcp structure.
C. In the fluorite structure `(CaF_(2))`, the `Ca^(2+)` ions are located at the lattice points and the fluoride ions fill all the tetrahedral holes in the cep crystal.
D. In the antifluorite structure `(Li_(2)O, Rb_(2)S)` the cations are located at the lattice points and anions fill the tetrahedral holes in the ccp structure.

Answer

B, D

Explanation

b) For HCP if these are .n.atoms per unit cell then the no of tetrahedral voids are 2n. So these is 2n tetrahedral voids per atom.
d) In antifluorite structure cation fill the tetrahedral  holes not anions.