• crystalline solid – a solid with a regular arrangement of its components
  • amorphous solid – a solid with a considerable disorder in its structure
  • lattice – an arrangement of points or particles or objects in a regular periodic pattern in 2 or 3 dimensions
  • unit cell – the smallest group of atoms or molecules whose repetition at regular intervals in three dimensions produces the lattices of a crystal
  • X-ray diffraction – a technique for establishing the structure of crystalline solids by directing X rays of a single wavelength at a crystal and obtaining a diffraction pattern from which interatomic spaces can be determined.
  • ionic solid – solids composed of cations and anions.
  • molecular solid – solid composed of neutral molecules at its lattice points
  • atomic solid – solid composed of atoms at its lattice points
  • alloy – solids with metallic properties and contains a mixture of elements
  • substitutional alloy – host metal atoms replaced by other metal atoms of similar sizes
  • interstitial alloy – holes are occupied by small atoms
  • network solid – an atomic solid containing strong covalent bonds
  • glass – an amorphous solid obtained through the mixture of solica with other compounds. It is heated above its melting point then rapidly cooled.
  • ceramic – nonmetallic material made from lay. Similar to glass but brittle and heterogenous.
  • semiconductor – substance that conducts a small amount of electricity at room temeprature.


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