Question:

Which of the following statements is not true about the hexagonal close packing?

Updated On: Jul 7, 2022
  • The coordination number is $12$
  • It has $74\%$ packing efficiency
  • Tetrahedral voids of the second layer are covered by the spheres of the third layer
  • In this arrangement spheres of the fourth layer are exactly aligned with those of the first layer
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The Correct Option is D

Solution and Explanation

When third layer is placed over the second layer and all tetrahedral voids are covered by the spheres of the third layer then in this case, the spheres of the third layer are exactly aligned with those of the first layer. ($ABAB$.... pattern). This structure is called hexagonal close packed $(hcp)$ structure.
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Notes on The solid state

Concepts Used:

Solid State

Solids are substances that are featured by a definite shape, volume, and high density. In the solid-state, the composed particles are arranged in several manners. Solid-state, in simple terms, means "no moving parts." Thus solid-state electronic devices are the ones inclusive of solid components that don’t change their position. Solid is a state of matter where the composed particles are arranged close to each other. The composed particles can be either atoms, molecules, or ions. 

Solid State

Types of Solids:

Based on the nature of the order that is present in the arrangement of their constituent particles solids can be divided into two types;

  • Amorphous solids behave the same as super cool liquids due to the arrangement of constituent particles in short-range order. They are isotropic and have a broad melting point (range is about greater than 5°C).
  • Crystalline solids have a fixed shape and the constituent particles are arranged in a long-range order.