Calculate the number of atoms present in unit cell of an element having molar mass $$190 \mathrm{~g} \mathrm{~mol}^{-1}$$ and density $$20 \mathrm{~g} \mathrm{~cm}^{-3}$$.

$$\left[\mathrm{a}^3 \cdot \mathrm{N}_{\mathrm{A}}=38 \mathrm{~cm}^3 \mathrm{~mol}^{-1}\right]$$

Which of the following characteristic properties is NOT true for crystalline solid?

Calculate the edge length of unit cell of metal which crystallises to bcc structure.

(Radius of metal atom $$=173 \mathrm{~pm}$$ )

What is the total number of Bravais lattices present for different crystal systems?