Potassium crystallizes in a $bcc$ lattice. What is the coordination number of potassium in the potassium metal?

$A^{+}B^{-}$ shows rock salt type arrangement. Edge length of unit cell is $6 \ \mathring{A}$. If radius of $A^{+}$ is $1 \ \mathring{A}$,then the incorrect option is:

If the distance between $Na^{+}$ and $Cl^{-}$ ions in sodium chloride crystal is $X \ pm$, the length of the edge of the unit cell is

The coordination number of $Ba^{2+}$ ion in Barium fluoride $(BaF_2)$ is $8$. What must be the coordination number of fluoride ion $(F^{-})$?

What is the coordination number of the $hcp$ crystal lattice?

The edge length of a face-centered cubic unit cell of an ionic substance is $508 \ pm$. If the radius of the cation is $110 \ pm$, what is the radius of the anion in $pm$?