In metallic solids,the number of atoms for th | vedclass

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(C) The correct option is $C$.$A$ face-centered cubic $(fcc)$ unit cell contains atoms at all the corners and at the center of all faces of the cube.T

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$4, 2$

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(C) The correct option is $C$.$A$ face-centered cubic $(fcc)$ unit cell contains atoms at all the corners and at the center of all faces of the cube.Thus,the number of atoms in $fcc = (\frac{1}{8} 	imes 8) + (\frac{1}{2} 	imes 6) = 1 + 3 = 4$.$A$ body-centered cubic $(bcc)$ unit cell has an atom at each of its corners and also one atom at its body center.Thus,the number of atoms in $bcc = (\frac{1}{8} 	imes 8) + 1 = 1 + 1 = 2$.

In metallic solids,the number of atoms for the face-centered and the body-centered cubic unit cells are,respectively:

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