- A Polymorphous
- B Isomorphous
- C Semimorphous
- D Multimorphous
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Polymorphous is when a single substance can crystallize in two or more forms depending upon the conditions. Isomorphous is when two or more substances have the same crystal structure.
Amorphous solids behave like fluids and flow very slowly under the influence of gravity. Therefore, they are considered to be supercooled liquids.
An amorphous solid has short range order present which is independent of the temperature. Long range order is present in crystalline solids.
There are two polymorphous structures of sulfur, rhombic and monoclinic. Polymorphous structures occur when a single substance can crystallize in two or more forms depending upon the conditions.
Molecular solids are solids that are collections of molecules held together by intermolecular forces. In polar molecules such as HCl, So2, etc., the molecules are held together by dipole-dipole interactions, which is the attraction between the positive and negative ends of the molecules.
Diamond is an example of a covalent solid, which is a type of solid in which the constituent particles are attached to each other by covalent bonds. Examples of covalent solids include diamond, graphite, silicon, SiC, AIN, and quartz.
Hexaclinic is not a crystal system. The other crystal systems are cubic, tetragonal, rhombohedral or trigonal, orthorhombic or rhombic, monoclinic, triclinic and hexagonal.
The unit cell in which the constituent atoms are present only at the corner is known as simple cubic cell. It is also referred to as a primitive cubic cell. In the simple cubic cell, each corner atom is shared by eight different unit cells.
Lattice points are the points at which atoms may be present on the unit cell. They indicate the position of atoms in a crystal.
Quartz is a common example of covalent solids. In covalent solids, the constituent particles are attached to each other by covalent bonds. Diamond, graphite, silicon are other examples of covalent solids.