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 best describes the Lewis dot structure for the neutral compound Na2O?

Oxygen shares two pairs of electrons with each Na atom, forming double bonds.

Each Na atom shares one electron with O, forming two single covalent bonds between Na and O.

The structure consists of three atoms sharing electrons equally in a trigonal planar arrangement.

Each Na atom donates one electron to O, resulting in two Na+ ions and one O2− ion, with no shared electron pairs.

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Verified step by step guidance

Step 1: Identify the types of elements involved and their typical bonding behavior. Sodium (Na) is a metal and oxygen (O) is a nonmetal. Metals tend to lose electrons and form cations, while nonmetals tend to gain electrons and form anions.

Step 2: Determine the total number of valence electrons for the compound Na2O. Sodium has 1 valence electron each, and oxygen has 6 valence electrons, so total valence electrons = 2(1) + 6 = 8 electrons.

Step 3: Consider the nature of bonding between Na and O. Since Na is a metal and O is a nonmetal, the bonding is typically ionic rather than covalent. Sodium atoms tend to lose their valence electrons to oxygen, forming Na+ ions and O2− ions.

Step 4: Draw the Lewis structure showing that each Na atom donates one electron to oxygen, resulting in two Na+ ions and one O2− ion. Oxygen achieves a full octet by gaining two electrons (one from each Na), and there are no shared electron pairs (no covalent bonds).

Step 5: Conclude that the correct Lewis structure for Na2O is ionic, with Na+ and O2− ions, rather than covalent bonds or shared electron pairs.