﻿ Niobium crystallises in body centered cubic structure. If density is 8.55 g cm–3, calculate atomic radius of niobium using its atomic mass 93 u. from Chemistry The Solid State Class 12 Nagaland Board

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Niobium crystallises in body centered cubic structure. If density is 8.55 g cm–3, calculate atomic radius of niobium using its atomic mass 93 u.

We have give that,
Density (d)=8.55 g Cm-3
Atomic mass (M) =93u =93 gMol-1
Atomic radius (r) = ?

We know that, Avogadro number Na =6.022 x 10 23 mol-1

since given lattice is bcc

therefore
Number of atoms per unit cell (z) =2

we know that

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