Which of the following describes the arrangement of atoms in a hexagonal close-p

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Question: Which of the following describes the arrangement of atoms in a hexagonal close-packed (HCP) structure? (2019)

Options:

Correct Answer: ABABAB

Exam Year: 2019

Solution:

In a hexagonal close-packed (HCP) structure, the arrangement of atoms follows an ABABAB pattern.

Which of the following describes the arrangement of atoms in a hexagonal close-packed (HCP) structure? (2019)

Which of the following describes the arrangement of atoms in a hexagonal close-packed (HCP) structure? (2019)

Step 1: Understand that a hexagonal close-packed (HCP) structure is a way atoms are arranged in a solid.
Step 2: Recognize that in HCP, atoms are stacked in layers.
Step 3: Identify the pattern of stacking: the first layer is called 'A'.
Step 4: The second layer is placed over the first layer, but it is different, and this layer is called 'B'.
Step 5: The third layer goes back to the arrangement of the first layer, which is again 'A'.
Step 6: This pattern continues, alternating between 'A' and 'B', creating an ABABAB sequence.

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