Question

if an element ( atomic mass =60) occurs in bcc structure with cell edge 300 pm. what is its density?

Answer 1

Density = mZ/N × a³

m = 60

Z = 2

N = 6×10²³

a = 300pm = 3×10^-8cm

a³ = 27×10^-24cm

So, density = 60×2/6×10²³×27×10^-24

= 120/1620

=0.074gm/cm³.