Question

of the cubic unit Cell UNIT CEL CURICS KEY 1. W MODEL a length of a side of the remete radius of an atom Primitive Cubic 2. W its The aims a fouching ang anaye Face-Centered Cubic (aka Cubic Close-Packed) The atoms are touching along a face diagonal 1/8 of an atom Body-Centered Cubic The atoms are fouching along a body diagonal 1/8 of an atom whole atom Chapter 11: Phases of Matter

Answer 1

10o 1st unit cell Primitive cubic unit cell . and as a Face-centered cubie unit cell 3rd , ja → Body - centered cubic unet cell @ Primitive cubie une't elll → a=27 Ta= length of side of the cuber [8= radius of metallic atom] Face-centered cubic unit cell = Quay Body- ." 29 og 1 + a = 48 ③ The atom located at the corners of the unit celles Common among 8 unit cells attached to each other ie, the atom at the corner is equally shared by ? unit cells and its contribution to one unit cell - to of et. The atom at the center of a side of the unit cell is common between two unit cells attached to each other, ie, it is equally shared between two unit, cells and its contribution to one unit call is / of it. 4. No. of atoms in primitive cubie unit cell = **8=1 No. 99 99 99 Face-centered 19 r ? =(**8+1x6) = 4 No. 99.9999 Body-centered 999 ,, ftet8+) = 2