Molecular Structures Trevor B., Savannah A., Michael H.

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Presentation transcript:

Molecular Structures Trevor B., Savannah A., Michael H.

Structural Formulas / Lewis Structure Structural Formulas are models using symbols of elements to show positions of atoms when bonded. Lewis Structures show estimated models of the positions of both atoms and electrons in bonds. What is the Structural formula of H 2 O? What is the Lewis Structure of H 2 O?

Steps for drawing Lewis Structures 1: Predict The Location of the Atoms 2: Determine The Number Of Electrons Available 3: Determine The Number Of Electrons used in Bonding 4: Draw bonded pairs 5: Determine electron pairs remaining 6: Draw in remaining atoms and determine middle atom

Structural Formula/ Lewis Structure Structural Formula of Water: Lewis Structure of Water:

Types of Bonds Single Bonds: Double Bonds: Triple Bonds

~Resonance~ Resonance: Condition where molecules can be represented by more than one Lewis Structure Examples: NO 3 (Nitrate) and H 3 C 2 O (Acetate)

~Exceptions~ Odd Number Of Valence Electrons: Not enough electrons to form full octets/bonds Expanded Octet: More electrons than normal octet Sub Octet: Less electrons than normal octet Coordinate Covalent Bond: An atom donates 2 electrons to a hobo atom who needs them

Exception Models Sub Octet: Expanded Octet: Coordinated:

Resources/Activities: t%20tutorial.swf t%20tutorial.swf astr.gsu.edu/hbase/pertab/perlewis.html Resource: Book