Which of the following is/are correct about $\mathrm{CsCl}$?

Which mineral can have the silicates skeleton as shown below?

Copper has a face-centred cubic structure with a unit-cell edge length of $3.61 \mathrm{\AA }$. What is the size of the largest atom (in pm), which could fit into the interstices of the copper lattice without distorting it?

[Hint: Calculate the radius of the smallest circle in the figure.]

A metal cystallises into two cubic phases, f.c.c and b.c.c. whose unit-cell lengths are $3.5 {\mathrm{A}}^{°}$ and $3.0 \mathrm{A}°$. Calculate the ratio of densities of f.c.c. and b.c.c.

Give answer after multiplying with 100 and rounding off to the nearest integer value.

Potassium metal crystallizes in a face-centred arrangement of atoms where the edge of the unit cell is $0.574 \mathrm{nm}$. Determine the shortest separation of any two potassium nuclei in pm is.

Sodium metal crystallizes in a body-centred cubic lattice with the cell edge $\mathrm{a}=4.29 \mathrm{\AA }$. What is the radius of the sodium atom in pm? (Round off your answer to the nearest integer value.)

A metallic element has a simple cubic lattice. Each edge of the unit cell is $3.0 \mathrm{\AA }.$ The density of the metal is $8.5 \mathrm{g}/\mathrm{cc}.$ How many unit cells will be present in $50 \mathrm{g}$ of the metal?

(Give your answer in multiples of ${10}^{23}$.)