CHEM 101 Lecture Notes - Lecture 38: Metal, Intermolecular Force, Network Covalent Bonding

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CHEM 101-Lecture 38-Types of Solids
Solids
Matter is in a solid state when its particles are in a fixed position and cannot move past
one another
Solids can be amorphous (particles arranged randomly), or crystalline (particles
arranged in a repeating pattern)
There are four major types of solids: molecular, metallic, ionic, and covalent-network
solids
Molecular solids
Solids which are composed of molecules of atoms held together by intermolecular forces
Molecular solids are generally soft and have low melting points, because intermolecular
forces are weaker than other forms of bonding
Molecular solids do not conduct electricity, because the electrons are not able to move
throughout the solid
Ex: ice
https://www.chemguide.co.uk/atoms/structures/molecular.html
Metallic solids
Solids which are composed of metal atoms held together by metallic bonding, in which
the valence electrons are delocalized throughout the solid
This makes metallic solids good conductors of electricity as both solids and
liquids; electrons are able to move freely, which allows electricity to travel through
the material
The hardnesses and melting points of metallic solids are variable
Ex: Copper, silver, and gold
https://www.ck12.org/chemistry/classes-of-crystalline-solids/lesson/Classes-of-Crystalline-Solids-CHEM/
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