Table of contents

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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

2. Atoms & Elements

Isotopes

General Chemistry

2. Atoms & Elements

Isotopes

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Multiple Choice

How many neutrons does a lithium (Li) atom typically have?

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Identify the atomic number of lithium (Li) from the periodic table. The atomic number is the number of protons in the nucleus of an atom, and for lithium, it is 3.

Determine the most common isotope of lithium. The most common isotope of lithium is lithium-7, which is denoted as \( ^7Li \).

Understand that the mass number of an isotope is the sum of protons and neutrons in the nucleus. For \( ^7Li \), the mass number is 7.

Use the formula: \( \text{Number of neutrons} = \text{Mass number} - \text{Atomic number} \). For lithium-7, this becomes \( 7 - 3 \).

Calculate the number of neutrons by subtracting the atomic number (3) from the mass number (7) to find the typical number of neutrons in a lithium atom.