Niobium has a bcc crystal structure, an atomic radius of 0.143 nm and an atomic weight of 92.91 g/mol. calculate the theoretical density for nb.

The theoretical density for Niobium is .

Explanation:

Formula used :  

where,

= density  of the unit cell

Z = number of atom in unit cell

M = atomic mass

= Avogadro's number  

a = edge length of unit cell

We have :

Z = 2 (BCC)

M = 92.91 g/mol ( Niobium)

Atomic radius for niobium = r = 0.143 nm

Edge length of the unit cell = a

r = 0.866 a (BCC unit cell)

On substituting all the given values , we will get the value of 'a'.

The theoretical density for Niobium is .

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