Representing Compounds - Molecular

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Presentation transcript:

Representing Compounds - Molecular Molecular formula – shows the types and numbers of atoms combined in a single molecule of a compound Ex. CO, H2O2, SO3, O2 Chemical formula – shorthand representation of the composition of a substance using atomic symbols and numerical subscripts

Representing Compounds - Molecular Structural formula – shows kind, number, arrangement, and bonds (single, double, or triple) of the atoms in a molecule (or polyatomic ion)

Representing Compounds - Molecular Structural formula – indicates kind, number, arrangement, and bonds of the atoms in a molecule Ex.

Representing Compounds - Molecular Lewis structures - diagrams that show valence e- as dots, the inner e- and nucleus are included in the letter symbol for the element being represented

Representing Compounds - Molecular Lewis structures Reminder… Group 1

Representing Compounds - Molecular Lewis structures Reminder… Group 2

Representing Compounds - Molecular Lewis structures Reminder… Group 13

Representing Compounds - Molecular Lewis structures Reminder… Group 14

Representing Compounds - Molecular Lewis structures Reminder… Group 15

Representing Compounds - Molecular Lewis structures Reminder… Group 16

Representing Compounds - Molecular Lewis structures Reminder… Group 17

Representing Compounds - Molecular Lewis structures Reminder… Group 18

Representing Compounds - Molecular Lewis structures Structures of individual elements may be joined to form compounds pairs of dots (or a dash) between symbols represent bonds (or electron pairs), dots adjacent only to one symbol are unshared e-

Representing Compounds - Molecular Lewis structures… Lone (unshared) pair of e- – pair of e- that is not involved in bonding, but instead belongs exclusively to one atom

Representing Compounds - Molecular Lewis structures Ex. F2, NH3, H2O, CH4, O2, CO2, N2, CH2O, C2H2, PI3 (must draw structures)

Representing Compounds - Molecular Lewis structures Octet exceptions: Less than full octet Ex: Boron compounds such as BF3

Representing Compounds - Molecular Lewis structures Octet exceptions: More than full octet – atoms beyond 2nd period, most often S & P (extra e- go to 3d level) Ex: SF4

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