Table of contents

1. Intro to General Chemistry3h 48m
2. Atoms & Elements4h 16m
3. Chemical Reactions4h 10m
4. BONUS: Lab Techniques and Procedures1h 38m
5. BONUS: Mathematical Operations and Functions48m
6. Chemical Quantities & Aqueous Reactions3h 53m
7. Gases3h 49m
8. Thermochemistry2h 37m
9. Quantum Mechanics2h 58m
10. Periodic Properties of the Elements3h 9m
11. Bonding & Molecular Structure3h 29m
12. Molecular Shapes & Valence Bond Theory1h 57m
13. Liquids, Solids & Intermolecular Forces2h 23m
14. Solutions3h 1m
15. Chemical Kinetics2h 53m
16. Chemical Equilibrium2h 29m
17. Acid and Base Equilibrium5h 1m
18. Aqueous Equilibrium4h 47m
19. Chemical Thermodynamics1h 50m
20. Electrochemistry2h 42m
21. Nuclear Chemistry2h 36m
22. Organic Chemistry5h 7m
23. Chemistry of the Nonmetals2h 39m
24. Transition Metals and Coordination Compounds3h 16m

11. Bonding & Molecular Structure

Lewis Dot Structures: Neutral Compounds

General Chemistry

11. Bonding & Molecular Structure

Lewis Dot Structures: Neutral Compounds

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Multiple Choice

Which of the following statements correctly describes the Lewis dot structure of the neutral compound N3 (azide ion)?

It contains one resonance structure with a bent geometry and a total of 18 valence electrons.

It contains two resonance structures with a triangular arrangement of nitrogen atoms and a total of 14 valence electrons.

It contains three resonance structures, each with a linear arrangement of nitrogen atoms and a total of 16 valence electrons.

It contains two resonance structures with a total of 16 valence electrons and a linear arrangement of nitrogen atoms.

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Verified step by step guidance

Determine the total number of valence electrons for the azide ion (N3⁻). Each nitrogen atom contributes 5 valence electrons, and since the ion has a -1 charge, add 1 extra electron. So, total valence electrons = 3 × 5 + 1 = 16.

Recognize that the azide ion consists of three nitrogen atoms arranged linearly, as nitrogen atoms tend to form linear chains in such ions due to their bonding preferences and electron repulsions.

Draw possible Lewis structures that distribute the 16 valence electrons among the three nitrogen atoms, ensuring that each structure satisfies the octet rule as much as possible and accounts for the negative charge.

Identify resonance structures by moving electrons (especially pi bonds and lone pairs) between the nitrogen atoms without changing the positions of the atoms themselves. For azide, there are three such resonance structures, each showing different placements of double and triple bonds along the linear chain.

Confirm that all resonance structures have the same total number of valence electrons (16) and maintain a linear geometry, which supports the statement that the azide ion has three resonance structures with linear arrangement and 16 valence electrons.