Chemistry - Solid State Question with Solution | TestHub

Density is given by

$\rho =\frac{\text{Z}\times \text{M}}{{\text{N}}_{\text{A}}\times {\left(\text{a}\right)}^3}$

Density$\text{= 4}{\text{g/cm}}^3$(given)

$\mathrm{\therefore 4}=\frac{72\times \text{Z}}{6\times {\text{10}}^{23}\times {\left(5\times 10^{-8}\right)}^3}$

$=\frac{72\times \text{Z}}{6\times {\text{10}}^{23}\times 10^{-24}\times 125}$

$\therefore \text{Z}=4$