Which close-packed structure is represented by ABAB… arrangement, and which one by ABCABC… arrangement?

Which represent a possible arrangement?

Write the name of two important kinds of holes normally encountered in a closed packed structure. How many such holes are present per sphere in a close packed arrangement?

Which one of the following represents an impossible arrangement –

Fraction of empty space in ABAB type arrangement in 3D

Fraction of empty space in ABAB type arrangement in 3D

The closest-packing sequence ABAB....... represents

What type of close packing is observed when (a) ABAB pattern of arrangement of layers (b). ABC ABC pattern of arrangement of layers?

Coordination number in ABAB … type arrangement is