Lesson 4 - Covalent Bonding (Structure and Bonding)
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Covalent Bond
Formed when atoms share electrons to achieve a full outer shell
Diatomic
Two atoms
Giant Covalent structure
Large numbers of atoms joined together by covalent bonds in regular network
Molecules
Two or more atoms held together by chemical bonds
Polymers
Large molecules formed from identical smaller molecules called monomers
Advantage of Covalent substances of Structural Formula
Shows the bonds between atoms
3 Ways of representing Covalent Substances
Dot and Cross Structural Formulae 3D Structure
Advantage of Covalent substances of Dot and Cross
Shows the pairs of outer electrons and which atoms they have come from
Advantage of Covalent substances of 3D structure
Shows how the atoms are connected and arranged in space
Limitation of Covalent substances of Structural Formula
Doesn’t show which atoms the electrons in the bonds have come from
Limitation of Covalent substances of Dot and Cross diagram
Doesn’t show how the atoms are arranged in space
Limitation of Covalent substances of 3D structure
Doesn’t show which atoms the electrons in the bonds have come from