Element $Nb$

Atomic Mi $,93g$

Structure $BCC,\frac{g}{c}m3$

Lattice Par $,3\mathrm{.}3008nm$

The element with structure and lattice parameter is given avobe. It contains one vacancy per $200$ unit cells. Calculate

$($a$)$ the number of vacancies per cubic centimeter; and $($b$)$ the density of element

Please solve the questions in the Excel file using formulas.