Ionic solids are those crystalline solids in which the particles forming the crystal are positively and negatively charged ions, held together by strong electrostatic forces of attraction (ionic bonds). Examples: The crystals of NaCl, KBr etc. are ionic solids. Properties of ionic Solids (1) Physical State: A well-defined geometrical pattern, describe the arrangements of the…
In 1850, a French mathematician August Bravis observed that crystal lattice of substances can be categorized into seven types. These are called Bravis Lattices and their units cells are referred to as Bravis unit cells. A crystal system may be identified by the dimensions of a unit cell along its three edges or axe, a,…
A crystal lattice is defined as an array of points representing atoms, ions or molecules of a crystal, arranged at different sites in three dimensional space. Formation: A crystal may contains atoms, ions or molecules. In crystalline solids, these atoms, ions or molecules are located at definite positions in space. These are represented by points…
Geometrical Shape Crystalline Solids Due to definite and orderly arrangement of atoms, ions or molecules in three-dimensional space, all the crystalline solids have a definite, distinctive geometrical shape. For a given crystal, the interfacial angles, at which the surfaces intersect, are always the same no matter in which shape they are grown. The faces and…
Solids can be classified on the basis of the regular arrangements of constituent atoms, ions or molecules. There are two types of solids in this respect: Crystalline Solids Those solids in which atoms, ions or molecules are arranged in a definite three-dimensional patterns with regular and repetitive characteristics are called crystalline solids. Amorphous Solids The…
The substances which are rigid, hard, have definite shape and definite volume are called solids. General Properties Of Solids Rigidity of Solids The atoms, ions or molecules of a solid do not possess sufficient energy to move about nor take up different positions like the molecules of a gas or a liquid. They have fixed…