Find the number of atoms per unit cell if edge length is 300pm, density = 3 g/cm3 , molecular mass = 40 g(nearest integer)
Find the number of atoms per unit cell if edge length is 300pm, density = 3 g/cm3 , molecular mass = 40 g(nearest integer)
Solution and Explanation
\(\text{The number of atoms per unit cell is}\):
\(Z=\frac{3}{40}\times6\times0.1\times(4.05)^3\)
\(\approx 3.056 \)
\(\approx3\)
\(\text{The correct answer is 3.}\)
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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.