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The atomic radius of metal X is 125 picometers (pm) and a crystal of metal X has a unit cell that is face-centered cubic. Calculate the density of metal X (atomic weight = 42.3 g/mol).

Verified Answer :

We have that the Density of metal X  is mathematically given as

\(\phi= 6359.44 Kg/m^3\)

Density of metal

Generally the equation for the side of fcc  is mathematically given as

\(Fcc=2*\sqrt(2) *radius of metal\\\\Fcc== 2*1.414*125\\\\Fcc 353.5*10^-12 m \\\\\)

Where

volume of 1 unit cell of fcc

\(FccV= (353.5*10^-12)^3\\\\FccV =44174155.375 *10^-36 m^3\\\\\)

And

weight of 1 atom

\(Wa= moleular weight / avogadro number\\\\Wa = 42.3/(6.023 *10^23) \\\\Wa= 7.023 *10^-23 gm/atom\\\\\)

Therefore

density

\(\phi= (28.0923 *10^-26) / ( 44174155.375 *10^-36)\)

\(\phi= 6359.44 Kg/m^3\)

For more information on Atoms visit

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