​​a metal M crystallizes in FCC and BCC structures depending on temperature .the ratio of its densities in fcc and bcc structures would be ?

  • -6
For the FCC structure Z1=4 and
BCC structure, Z2=2
Volume is V and Atomic mass is M.
Density of the element=(mz)/(N0a3),
as m , N0​ and a 
are same for same metal (and N0 is a constant)
We get ,
Hence, the ratio of densities of
FCC to BCC is 2:1
  • -14
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