Question:
In the cubic close packing, the unit cell has
In the cubic close packing, the unit cell has
Updated On: Jul 6, 2022
- $4$ tetrahedral voids each of which is shared by four adjacent unit cells
- $4$ tetrahedral voids within the unit cell
- $8$ tetrahedral voids each of which is shared by four adjacent unit cells
- $8$ tetrahedral voids within the unit cells
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The Correct Option is D
Solution and Explanation
Cubic close packing is also called face centred cubic.
No. of atoms per unit cell in $ccp$ (or $fcc) = 4$
$\therefore$ No. of tetrahedral voids $= 2 \times 4 = 8$
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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.
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.