Question:

A molecule contains atoms $x$ and $y$ so that $x$ occurs at the corners of the cube while $y$ at the face centre. The formula of the molecule can be

Updated On: Jul 2, 2022
  • $x y _{3}$
  • $x_{3} y$
  • $xy _{2}$
  • $x _{2} y$
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The Correct Option is A

Solution and Explanation

x atoms are at the corners of the cube, therefore, Number of x-atoms per unit cell $=\frac{1}{8}\times8=1$ y-atoms are at the face centre of cube ? Number of y-atoms per unit cell $=\frac{1}{2}\times6=3$ $\Rightarrow$ The formula of the molecule is xy
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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. 

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.