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CRYSTAL STRUCTURE OF MATTER (WEEK TWO)
WEEK TWO
CRYSTAL STRUCTURE OF MATTER
Solids can be classified into two. The classes are:
- Crystalline solids
- Non crystalline or Amorphous solids
CRYSTALLINE SOLIDS
Most solids have regular shapes which could be evident from their external appearances. In some, this regularity of form is not so evident and only with the aid of a microscope can their crystalline nature be revealed. Such solids which have definite geometric shapes are said to be crystalline. The shapes of crystals vary from substance to substance but crystals of a particular substance have the same shape irrespective of their size.
The regularity of form or shape observed in crystals is as a result of atoms, molecules or ions being closely packed together.
A crystal is a piece of solid matter in which the atoms, molecules or ions are arranged in a regularly repeating pattern or lattice. Examples of crystals are sodium chloride, copper ii) tetraoxosulphate(vi), ice, diamond, graphite, aluminium etc.
CRYSTAL LATTICE
The arrangement of particles in a crystal is called crystal lattice............
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