In the fluorite structure,the coordination number of $Ca^{2+}$ ion is

The crystal structure of the solid compound $XY$ is similar to $NaCl$. If the radius of the cation $X^+$ is $100 \, pm$, then the radius of the anion $Y^-$ will be ......... $pm$.

Potassium crystallizes in a $bcc$ lattice,hence the coordination number of potassium in potassium metal is

The radius of a calcium ion is $94 \text{ pm}$ and of the oxide ion is $146 \text{ pm}$. The possible crystal structure of calcium oxide will be

The coordination number of $Na^{+}$ in $NaCl$ is

$A$ metal $X$ crystallises in a face-centred cubic arrangement with the edge length $862 \, pm$. What is the shortest separation of any two nuclei of the atom? ........... $\, pm$