In a cubic close packed structure, fractional contributions of an atom at the edge centre and at the face centre in the unit cell are
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edge centre atom is shared by 4 adjacent edge of other atoms so in one cube there are 12 edge so its fractions is 12/4 and in face centre an atom is shared by two faces of adjacent atom so in cube there are 6 face centres so its fraction is 6/2 .....hope u like tHis
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