Table of contents

1. Matter and Measurements4h 29m
2. Atoms and the Periodic Table5h 23m
3. Ionic Compounds2h 18m
4. Molecular Compounds2h 18m
5. Classification & Balancing of Chemical Reactions3h 17m
6. Chemical Reactions & Quantities2h 35m
7. Energy, Rate and Equilibrium3h 46m
8. Gases, Liquids and Solids3h 25m
9. Solutions4h 10m
10. Acids and Bases3h 29m
11. Nuclear Chemistry56m
BONUS: Lab Techniques and Procedures1h 38m
BONUS: Mathematical Operations and Functions47m
12. Introduction to Organic Chemistry1h 34m
13. Alkenes, Alkynes, and Aromatic Compounds2h 12m
14. Compounds with Oxygen or Sulfur1h 6m
15. Aldehydes and Ketones1h 1m
16. Carboxylic Acids and Their Derivatives1h 11m
17. Amines38m
18. Amino Acids and Proteins1h 51m
19. Enzymes1h 37m
20. Carbohydrates1h 46m
21. The Generation of Biochemical Energy2h 8m
22. Carbohydrate Metabolism2h 22m
23. Lipids2h 26m
24. Lipid Metabolism1h 45m
25. Protein and Amino Acid Metabolism1h 37m
26. Nucleic Acids and Protein Synthesis2h 54m

2. Atoms and the Periodic Table

Subatomic Particles (Simplified)

GOB Chemistry

2. Atoms and the Periodic Table

Subatomic Particles (Simplified)

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Problem 25bTimberlake - 13th Edition

Textbook Question

Would you use the atomic number, mass number, or both to determine each of the following? c. number of particles in the nucleus

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Understand the definitions: The atomic number (Z) is the number of protons in an atom's nucleus, while the mass number (A) is the total number of protons and neutrons in the nucleus.

Identify the particles in the nucleus: The nucleus of an atom contains protons and neutrons.

Determine which number provides information about the total particles: The mass number (A) is the sum of protons and neutrons, thus it represents the total number of particles in the nucleus.

Recognize the role of the atomic number: The atomic number (Z) only tells us the number of protons, not the total number of particles in the nucleus.

Conclude that the mass number is used to determine the total number of particles in the nucleus, as it accounts for both protons and neutrons.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Atomic Number

The atomic number is the number of protons found in the nucleus of an atom. It uniquely identifies an element and determines its position on the periodic table. For example, carbon has an atomic number of 6, meaning it has 6 protons. The atomic number is crucial for understanding the chemical properties of an element.

Mass Number

The mass number is the total number of protons and neutrons in an atom's nucleus. It provides insight into the atom's overall mass and stability. For instance, a carbon atom with 6 protons and 6 neutrons has a mass number of 12. The mass number is essential for distinguishing between isotopes of an element, which have the same atomic number but different mass numbers.

Nucleus Composition

The nucleus of an atom is composed of protons and neutrons, collectively known as nucleons. The number of particles in the nucleus can be determined by the mass number, as it reflects the total count of these nucleons. Understanding the composition of the nucleus is fundamental in nuclear physics and chemistry, as it influences the atom's behavior in reactions and its stability.