Metallic iron crystallizes in a cubic lattice. The unit cell edge length is 287 pm. The density of iron is 7.87 g/cm3. How many iron atoms are within a unit cell?

The number of iron atoms in one unit cell are 2

Explanation:

To calculate the number of iron atoms in 1 unit cell, we use the equation to calculate the density of metal, which is:

where,

= density  =

Z = number of atom in unit cell = ?

M = atomic mass of metal = 55.85 g/mol

= Avogadro's number =

a = edge length of unit cell =    (Conversion factor:    )

Putting values in above equation, we get:

Hence, the number of iron atoms in one unit cell are 2

colorless gas, exhibiting a blue glow when placed in an electric field

b) solid

its a type of rock