Question:
Number of atoms in the unit cell of $Na ( BCC$ type crystal) and Mg (FCC type crystal) are respectively :
Number of atoms in the unit cell of $Na ( BCC$ type crystal) and Mg (FCC type crystal) are respectively :
Updated On: Aug 15, 2022
- 4,4
- 4,2
- 2,4
- 1,1
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The Correct Option is C
Solution and Explanation
Na unit cell (body centred cubic)
8 corner atoms $\times \frac{1}{8}=1$
1 atom placed inside the unit cell $=1$
Total atoms $=2$
Mg unit cell (Face centred cubic)
8 corner atoms $\times \frac{1}{8}=1$
6 face atoms $\times \frac{1}{2}=3$
Total atoms $=4$
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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).
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