1 / 11

Lewis Dot Structures (Washington University)

Lewis Dot Structures (Washington University). Reading: BC Science 10 Outline Lewis Dot Structure Basics. Lewis Dot Structures. Developed by G. N. Lewis to serve as a way to describe bonding in polyatomic systems.

bruce-roberson
Download Presentation

Lewis Dot Structures (Washington University)

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Lewis Dot Structures(Washington University) • Reading: BC Science 10 • Outline • Lewis Dot Structure Basics

  2. Lewis Dot Structures • Developed by G. N. Lewis to serve as a way to describe bonding in polyatomic systems. • Central idea: the most stable arrangement of electrons is one in which all atoms have a “noble” gas configuration. • Example: NaCl versus Na+Cl- Na: [Ne]3s1 Cl: [Ne]3s23p5 Na+: [Ne] Cl-: [Ne]3s23p6 = [Ar]

  3. LDS Mechanics • Atoms are represented by atomic symbols surrounded by valence electrons. Lone Pair (6 x) • Electron pairs between atoms indicate bond formation. Bonding Pair

  4. LDS Mechanics (cont.) • Three steps for “basic” Lewis structures: Sum the valence electrons for all atoms to determine total number of electrons. Use pairs of electrons to form a bond between each pair of atoms (bonding pairs). Arrange remaining electrons around atoms (lone pairs) to satisfy the “octet rule” (“duet” rule for hydrogen).

  5. LDS Mechanics (cont.) • An example: Cl2O 20 e- 16 e- left

  6. LDS Mechanics (cont.) • An example: CH4 8 e- 0 e- left Done!

  7. LDS Mechanics (cont.) • An example: CO2 16 e- 12 e- left Octet Violation 0 e- left CO double bond

  8. LDS Mechanics (cont.) + • An example: NO+ + 10 e- 8 e- left +

  9. LDS Mechanics (cont.) NO3- 24 e-

More Related