Ch.9 - Bonding & Molecular StructureWorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds
Sections
Lewis Dot Symbols
Chemical Bonds
Dipole Moment
Octet Rule
Formal Charge
Lewis Dot Structures: Neutral Compounds
Lewis Dot Structures: Sigma & Pi Bonds
Lewis Dot Structures: Ions
Lewis Dot Structures: Exceptions
Lewis Dot Structures: Acids
Resonance Structures
Average Bond Order
Bond Energy
Coulomb's Law
Lattice Energy
Born Haber Cycle
Additional Practice
Lewis Dot Structure: Formal Charge
LearnAdditional Practice
Next SectionLewis Dot Structures: Acids

Lewis Dot Structure Exceptions happen when the central element violates the Octet Rule.

Lewis Dot Structure Exceptions

Concept #1: Lewis Dot Structures: Exceptions

Example #1: Draw the Lewis Dot Structure for xenon dibromide molecule, XeBr2.

Practice: Determine the Lewis Dot Structure for the following compound: SOCl2

Example #2: Draw the Lewis Dot Structure for the radical of nitrogen dioxide, NO2.

Practice: Draw the Lewis Dot Structure for the radical hydroxide, OH.

Practice: Draw the Lewis Dot Structure for POCl3.

Practice: Metalloids can sometimes adopt the bonding preferences of similar nonmetals. Based on your knowledge of expanded octets, draw the Lewis Dot Structure for the following ion, SiF62–.

Previous SectionLewis Dot Structures: Ions
Next SectionLewis Dot Structures: Acids
Additional Problems
Which compounds violate the octet rule? (Be sure to draw all the structures before you decide!)NO2     CH2Cl2     XeF4     NCl3a. NO2 and XeF4b. NO2 and CH2Cl2c. CH2Cl2 and NCl3d. XeF4 and NCl3
In which one of the following compounds can a valid Lewis structure be drawn but it is permissible for the central atom to violate the octet rule?a. NF3b. IF3c. PF3d. SbF3e. CO2
Which one of the following Lewis structures is definitely incorrect? 
Molecules of which compounds violate the octet rule?a) 1 and 2b) 1 and 3c) 2 and 3d) 2 and 4
Which of the species NO, BrO, CH3+, BF4– are radicals?1. NO and BrO only2. BrO and CH3+ only3. BrO and BF4+ only4. NO, CH3+ and BF4– only5. NO and CH3+ only6. BrO, CH3+ and  BF4– only7. NO and BF4– only
Which of the following molecules does NOT contain an exception to the octet rule?A. SF4B. NOC. BH3D. XeF2E. N2O
Consider the following set of molecules:I). BF3      II). CHBr3 (central atom is C)     III). Br2      IV). XeCl2       V). CO      VI). SF4Select the group that best fits the following statement: These molecules violate the octet rule.a) I, III, IV, VIb) I, IV, VIc) I, II, IVd) III, V, VIe) I, II, IV, VI
Consider the following moleculesI. BCl3        II. CHBr3 (C is the central atom)      III. Cl2        IV. XeBr2          V. COThese molecules do not follow the octet rule.I, IVI, III, IV, VIIII, V, VII, IV, VII, II, IV, VI
Which of these satisfy the octet rule and which do not? Drag the appropriate items to their respective bins.
Which of the following species is a radical?CH2OHCNHClOClONO2ClO
Which of the following contains an atom that does not obey the octet rule?a. KBrb. CO2c. ClF3d. ICl
Consider the following four molecules: CO32-, PF5, CS2, BBr3.Which of these satisfy the octet rule and which do not?