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

2. Atoms & Elements

Isotopes

General Chemistry

2. Atoms & Elements

Isotopes

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Multiple Choice

Which of the following statements describes an isotope?

Atoms of different elements with the same number of protons.

Atoms of different elements with the same atomic mass.

Atoms of the same element with different numbers of electrons.

Atoms of the same element with different numbers of neutrons.

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Verified step by step guidance

Begin by understanding the concept of isotopes. Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons.

Recall that the number of protons in an atom defines the element. Therefore, isotopes must be atoms of the same element.

Consider the atomic mass of an element, which is influenced by both protons and neutrons. Isotopes have different atomic masses due to the variation in the number of neutrons.

Different elements cannot be isotopes of each other because they have different numbers of protons. Isotopes must be of the same element.

Electrons do not define isotopes. Variations in electron numbers lead to ions, not isotopes. Therefore, the correct description of an isotope is atoms of the same element with different numbers of neutrons.