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how do i calculate the volume of a unit cell and volume of atoms within a unit cell for FCC and BCC

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    What do you have available? You can get at this two or three ways. Do you know the side, a, for them?
    Then volume of unit cell = a3 for both BCC and FCC.

    For volume of atoms, look up the formula for volume of a sphere. I think it's (4/3)*pi*r3. For BCC, multiply that by 2 because there are two atoms per unit cell. For the FCC, multiply by 4 because there are four atoms per unit cell.

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