Question

Which of the following schemes for the generating close-packed planes are not ways of generating close-packed...

Which of the following schemes for the generating close-packed planes are not ways of generating close-packed lattices ?

There are more than one correct answers.

1) ABAB

2) ABBA

3) ABAC

4) ABABC

5) ABCABC

6) ABCBC

7) ABCCB
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Homework Answers

Answer #1

(1) ABAB - is close-packed - this is the HCP (Hexagonal Close-Packed) lattice.

(2) ABBA - is not close-packed - the adjacent B layers are not sphere to a crevice.

(3) ABAC - is close-packed - the fourth layer (C) is just the other alternative for the placement of the B layer.

(4) ABABC - is close-packed - this is similar to case (3).

(5) ABCABC - is close-packed - this is the CCP (Cubic Close-Packed) lattice.

(6) ABCBC ... is close-packed - this is the same as case (4).

(7) ABCCB ... is not close-packed - the adjacent C layers are not sphere to a crevice.

Hence, the correct answers are the options 2 and 7.

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