I. Lewis Diagrams (p. 202 – 213) Lecture 2.

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Presentation transcript:

I. Lewis Diagrams (p. 202 – 213) Lecture 2

The Octet Rule Chemical compounds tend to form so that each atom, by gaining, losing, or sharing electrons, has an (8) octet of electrons in its valence shell. 8 is Great! H He

Lewis Dot Shows how valence electrons are arranged among atoms in a molecule. Reflects central idea that stability of a compound relates to noble gas electron configuration. CH4 H2O I started it for you Try one yourself NH3

A. Octet Rule Remember… Most atoms form bonds in order to have 8 valence electrons.

F B F F H O H N O F F F S F Very unstable!! A. Octet Rule Exceptions: Hydrogen  2 valence e- Groups 1,2,3 get 2,4,6 valence e- Expanded octet  more than 8 valence e- (e.g. S, P, Xe) Radicals  odd # of valence e-

B. Drawing Lewis Diagrams Find total # of valence e-. Arrange atoms - singular atom is usually in the middle. Form bonds between atoms (2 e-). Distribute remaining e- to give each atom an octet (recall exceptions). If there aren’t enough e- to go around, form double or triple bonds.

B. Drawing Lewis Diagrams CF4 1 C × 4e- = 4e- 4 F × 7e- = 28e- 32e- F F C F - 8e- 24e-

B. Drawing Lewis Diagrams BeCl2 1 Be × 2e- = 2e- 2 Cl × 7e- = 14e- 16e- Cl Be Cl - 4e- 12e-

B. Drawing Lewis Diagrams CO2 1 C × 4e- = 4e- 2 O × 6e- = 12e- 16e- O C O - 4e- 12e-

C. Polyatomic Ions To find total # of valence e-: Add 1e- for each negative charge. Subtract 1e- for each positive charge. Place brackets around the ion and label the charge.

O O Cl O C. Polyatomic Ions ClO4- 1 Cl × 7e- = 7e- 4 O × 6e- = 24e-

H H N H C. Polyatomic Ions NH4+ 1 N × 5e- = 5e- 4 H × 1e- = 4e- 9e-

D. Resonance Structures Molecules that can’t be correctly represented by a single Lewis diagram. Actual structure is an average of all the possibilities. Show possible structures separated by a double-headed arrow.

D. Resonance Structures O S O O O S O O O S O

D. Resonance-Occurs when more than one valid Lewis structure can be written for a particular molecule.

Structural Formula Shows shared pair of electrons by a dashed line.

Single bond- 1 pair of electrons Double bond- 2 pair of electrons Triple bond- 3 pair of electrons Try a couple: O2 N2